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74LV123 Dual retriggerable monostable multivibrator with reset
Product data Supersedes data of 1998 Apr 20 2003 Mar 13
Philips Semiconductors
Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
FEATURES
* Optimized for Low Voltage applications: 1.0 V to 5.5 V * Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V * Typical VOLP (output ground bounce) < 0.8 V @ VCC = 3.3 V, * Typical VOHV (output VOH undershoot) > 2 V @ VCC = 3.3 V, * DC triggered from active HIGH or active LOW inputs * Retriggerable for very long pulses up to 100% duty factor * Direct reset terminates output pulses * Schmitt-trigger action on all inputs except for the reset input * Output capability: standard (except for nREXT/CEXT) * ICC category: MSI
Tamb = 25 C Tamb = 25 C
DESCRIPTION
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC/HCT123. The 74LV123 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). They are normally connected as shown in Figure 1. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering. Figures 1 and 2 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. For pulse width when CEXT < 10000 pF, see Figure 5. When CEXT > 10,000 pF, the typical output pulse width is defined as: tW = 0.45 x REXT x CEXT (typ.), where tW = pulse width in ns; REXT = external resistor in k; and CEXT = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times.
QUICK REFERENCE DATA
GND = 0V; Tamb = 25C; tr = tf v2.5 ns SYMBOL PARAMETER Propagation delay nA, nB to nQ, nQ nRD to nQ, nQ Input capacitance Power dissipation capacitance per monostable VCC = 3.3V, VI = GND to VCC1 CONDITIONS CL = 15 pF VCC = 3.3 V REXT = 5 k CEXT = 0 pF TYPICAL UNIT
tPHL/tPLH CI CPD
25 20 3.5 60
ns ns pF pF
NOTES: 1. CPD is used to determine the dynamic power dissipation (PD in W) PD = CPD x VCC2 x fi x N + (CL x VCC2 x fo) where: N = number of outputs switching; fi = input frequency in MHz; CL = output load capacitance in pF; fo = output frequency in MHz; VCC = supply voltage in V; (CL x VCC2 x fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES 16-Pin Plastic DIL 16-Pin Plastic SO 16-Pin Plastic SSOP Type II 16-Pin Plastic TSSOP Type I TEMPERATURE RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C ORDER CODE 74LV123N 74LV123D 74LV123DB 74LV123PW PKG. DWG. # SOT38-1 SOT109-1 SOT338-1 SOT403-1
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
PIN CONFIGURATION
1A 1B 1RD 1Q 2Q 2CEXT 2REXT/CEXT GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC 1REXT/CEXT 1CEXT 1Q 2Q 2RD 2B 2A
LOGIC SYMBOL
1CEXT 2CEXT 1REXT/CEXT 2REXT/CEXT 14 6 15 7
S
1Q Q 1 9 2 1A 2A 1B 2B T Q 1Q 2Q 2Q
13 5
SV00096
4 12
PIN DESCRIPTION
PIN NUMBER 1,9 2,10 3,11 4, 12 7 8 13, 5 14, 6 15 16 SYMBOL 1A, 2A 1B, 2B 1RD, 2RD 1Q, 2Q 2REXT/CEXT GND 1Q, 2Q 1CEXT, 2CEXT 1REXT/CEXT VCC FUNCTION Trigger inputs (negative-edge triggered) Trigger inputs (positive-edge triggered) Direct reset LOW and trigger action at positive edge Outputs (active LOW) External resistor/capacitor connection Ground (0V) Outputs (active HIGH) External capacitor connection External resistor/capacitor connection Positive supply voltage
10
RD
3 11
1RD 2RD
SV00097
FUNCTIONAL DIAGRAM
1CEXT 2CEXT 1REXT/CEXT 2REXT/CEXT 14 6 15 7
S
1Q Q 2Q
13 5
LOGIC SYMBOL (IEEE/IEC)
14 15 1 2 4 CX RCX 13 &
1 9 2 10
1A 2A 1B 2B T Q 1Q 2Q 4 12
RD
3 3 R 11
1RD 2RD
6 7 9 10
SV00099
CX RCX 5 &
12 11
R
SV00098
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
LOGIC DIAGRAM
nREXT/CEXT VCC
RD
Q
Q R R CL VCC CL
VCC R
CL
CL A
CL
B
R
It is recommended that Pin 6 (2CEXT) and Pin 14 (1CEXT) by externally grounded to Pin 8 (GND)
SV00100
FUNCTION TABLE
INPUTS nRD L X X H H nA X H X L L nB X X L H H
CEXT
OUTPUTS nQ L L* L* nQ H H* H*
VCC
REXT
NOTES: * If the monostable was triggered before this condition was established, the pulse will continue as programmed. H = HIGH voltage level L = LOW voltage level X = don't care = LOW-to-HIGH transition = HIGH-to-LOW transition = one HIGH level output pulse = one LOW level output pulse
to nCEXT (pin 14 or 6)
to nREXT/CEXT (pin 15 or 7)
SV00101
Figure 1. Timing component connection
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
RECOMMENDED OPERATING CONDITIONS
SYMBOL VCC VI VO Tamb DC supply voltage Input voltage Output voltage Operating ambient temperature range in free air See DC and AC characteristics VCC = 1.0 V to 2.0 V tr, tf Input rise and fall times except for Schmitt-trigger gg inputs VCC = 2.0 V to 2.7 V VCC = 2.7 V to 3.6 V VCC = 3.6 V to 5.5 V PARAMETER CONDITIONS See Note1 MIN 1.0 0 0 -40 -40 - - - - - - - - TYP 3.3 - - MAX 5.5 VCC VCC +85 +125 500 200 100 50 UNIT V V V C ns/V ns/V ns/V ns/V
NOTE: 1. The LV is guaranteed to function down to VCC = 1.0 V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2 V to VCC = 5.5 V.
ABSOLUTE MAXIMUM RATINGS1, 2
In accordance with the Absolute Maximum Rating System (IEC 134). Voltages are referenced to GND (ground = 0 V). SYMBOL VCC IIK IOK IO IGND, ICC Tstg PTOT PARAMETER DC supply voltage DC input diode current DC output diode current DC output source or sink current (standard outputs) DC VCC or GND current for types with standard outputs Storage temperature range Power dissipation per package - plastic DIL - plastic mini-pack (SO) - plastic shrink mini-pack (SSOP and TSSOP) for temperature range: -40 C to +125 C above +70 C derate linearly with 12 mW/K above +70 C derate linearly with 8 mW/K above +60 C derate linearly with 5.5 mW/K VI < -0.5 V or VI > VCC + 0.5 V VO < -0.5 V or VO > VCC + 0.5 V -0.5 V < VO < VCC + 0.5 V CONDITIONS RATING -0.5 to +7.0 20 50 25 50 -65 to +150 750 500 500 UNIT V mA mA mA mA C
mW
NOTES: 1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. Voltages are referenced to GND (ground = 0 V). LIMITS SYMBOL PARAMETER TEST CONDITIONS VCC = 1.2 V VIH HIGH level Input voltage VCC = 2.0 V VCC = 2.7 V to 3.6 V VCC = 4.5 V to 5.5 V VCC = 1.2 V VIL LOW level Input voltage VCC = 2.0 V VCC = 2.7 V to 3.6 V VCC = 4.5 V to 5.5 V VCC = 1.2 V; VI = VIH or VIL; -IO = 100 A VCC = 2.0 V; VI = VIH or VIL; -IO = 100 A VOH HIGH l level output ltt voltage out uts voltage; all outputs VCC = 2.7 V; VI = VIH or VIL; -IO = 100 A VCC = 3.0 V; VI = VIH or VIL; -IO = 100 A VCC = 4.5 V; VI = VIH or VIL; -IO = 100 A VO OH HIGH level output voltage; STANDARD outputs VCC = 3.0 V; VI = VIH or VIL; -IO = 6 mA VCC = 4.5 V; VI = VIH or VIL; -IO = 12 mA VCC = 1.2 V; VI = VIH or VIL; IO = 100 A VCC = 2.0 V; VI = VIH or VIL; IO = 100 A VOL LOW l level output ltt voltage out uts voltage; all outputs VCC = 2.7 V; VI = VIH or VIL; IO = 100 A VCC = 3.0 V; VI = VIH or VIL; IO = 100 A VCC = 4.5 V; VI = VIH or VIL; IO = 100 A VO OL II ICC ICC LOW level output voltage; STANDARD outputs Input leakage current Quiescent supply current; MSI Additional quiescent supply current VCC = 3.0 V; VI = VIH or VIL; IO = 6 mA VCC = 4.5 V; VI = VIH or VIL; IO = 12 mA VCC = 5.5 V; VI = VCC or GND VCC = 5.5 V; VI = VCC or GND; IO = 0 VCC = 2.7 V to 3.6 V; VI = VCC - 0.6 V 1.8 2.5 2.8 4.3 2.40 3.60 1.2 2.0 2.7 3.0 4.5 2.82 4.20 0 0 0 0 0 0.25 0.35 0.2 0.2 0.2 0.2 0.40 0.55 1.0 20.0 500 0.2 0.2 0.2 0.2 0.50 V 0.65 1.0 160 850 A A A V 1.8 2.5 2.8 4.3 2.20 V 3.50 V 0.9 1.4 2.0 0.7*VCC 0.3 0.6 0.8 0.3*VCC -40 C to +85 C MIN TYP1 MAX -40 C to +125 C MIN 0.9 1.4 2.0 0.7*VCC 0.3 0.6 0.8 0.3*VCC V V MAX UNIT
NOTE: 1. All typical values are measured at Tamb = 25 C.
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
AC CHARACTERISTICS
GND = 0 V; tr = tf 2.5 ns; CL = 50 pF; RL =1 k SYMBOL PARAMETER WAVEFORM CONDITION VCC (V) 1.2 tPHL Propagation delay nRD, nA, nB, to nQ Figure 3 CEXT = 0 pF REXT = 5 k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 1.2 tPLH Propagation delay nRD, nA, nB, to nQ Figure 3 CEXT = 0 pF REXT = 5 k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 1.2 tPHL Propagation delay nRD to nQ (reset) Figure 3 CEXT = 0 pF REXT = 5 k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 1.2 tPLH Propagation delay nRD to nQ (reset) Figure 3 CEXT = 0 pF REXT = 5 k 2.0 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Trigger pulse width gg nA = LOW Figure 3 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Trigger pulse width gg nB = HIGH Figure 3 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Reset pulse width nRD = LOW Figure 2 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Output pulse width nQ = HIGH nQ = LOW Q Figures 1, 2 CEXT = 100 nF REXT = 10 k 2.7 3.0 to 3.6 4.5 to 5.5 2.0 tW Output pulse width nQ = HIGH nQ = LOW Q Figures 1, 2 CEXT = 0 pF F REXT = 5 k 2.7 3.0 to 3.6 4.5 to 5.5 2.0 trt t Retrigger time gg nA, nB Figure 1 CEXT = 0 pF F REXT = 5 k 2.7 3.0 to 3.6 4.5 to 5.5 30 25 20 15 30 25 20 15 35 30 25 20 LIMITS -40 C to +85 C MIN TYP1 120 40 30 252 182 120 40 30 252 182 100 30 23 202 142 100 30 23 202 142 5 3.5 3.02 2.52 13 8 72 52 6 5 42 32 470 460 4502 4302 100 90 802 702 70 55 452 402 ns ns s 57 43 38 31 40 30 25 20 40 30 25 20 45 40 30 25 ns ns ns 68 51 45 36 ns 57 43 38 31 68 51 45 36 ns 76 56 48 40 92 68 57 46 ns 76 56 48 40 92 68 57 46 ns MAX -40 C to +125 C MIN MAX UNIT
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
AC CHARACTERISTICS (Continued)
GND = 0 V; tr = tf 2.5 ns; CL = 50 pF; RL = 1 k SYMBOL PARAMETER WAVEFORM CONDITION VCC (V) 1.2 2.0 REXT External timing resistor Figure 5 2.7 3.0 to 3.6 4.5 to 5.5 1.2 2.0 CEXT External timing capacitor Figure 53 2.7 3.0 to 3.6 4.5 to 5.5 NOTES: 1. Unless otherwise stated, all typical values are at Tamb = 25 C. 2. Typical value measured at VCC = 3.3 V. 3. Typical value measured at VCC = 5.0 V. 4. For other REXT and CEXT combinations see Figure 5. if CEXT > 10 nF, the next formula is valid: tW = K x REXT x CEXT (typ.) where, tW = output pulse width in ns; REXT = external resistor in k; CEXT = external capacitor in pF; K = constant = 0.45 for VCC = 5.0 V and 0.48 for VCC = 2.0 V. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 5. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be extended when the time between the active-going edges of the trigger pulses meets the minimum retrigger time. If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid: trt = 30 + 0.19R x C0.9 + 13 x R1.05 (typ.) If CEXT > 10 pF, the next formula (at VCC = 3.0 V) for the set-up time of a retrigger pulse is valid: = 41 + 0.15R x C0.9 x R1.05 (typ.) trt where, trt = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in k. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50 pF. No limits pF LIMITS -40 C to +85 C MIN 10 5 3 2 2 TYP1 MAX 1000 1000 1000 1000 1000 k -40 C to +125 C MIN MAX UNIT
AC WAVEFORMS
VM = 1.5 V at VCC 2.7 V; VM = 0.5 VCC at VCC t 2.7 V; VOL and VOH are the typical output voltage drop that occur with the output load.
nB INPUT tW
nB INPUT
nA INPUT trt tW
nRD INPUT tW
nQ OUTPUT tW tW tW
nQ OUTPUT tW tW
SV00139
SV00140
Figure 1. Output pulse control using retrigger pulse; nRD = HIGH.
Figure 2. Output pulse control using reset input nRD; nA = LOW.
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
nB INPUT (nA LOW)
VM
tW
nA INPUT (nB HIGH)
tW
nRD INPUT
VM
tPLH
tPLH
tW
Q OUTPUT
VM
tTLH tW
tTHL
tPHL tW
tPLH
Q OUTPUT
VM
tTHL
tTLH
tPLH
tPHL
SV00197
Figure 3.
Input (nA, nB, nRD) to output (nQ, nQ) propagation delays, the output transition times, and the input and output pulse widths.
2003 Mar 13
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
APPLICATION INFORMATION
0.8
Power-up considerations
`K' factor
When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of RX and CX. This output pulse can be eliminated using the circuit shown in Figure 6.
CX
RX VCC
0.4
nCEXT
nREXT/CEXT
Q A B "123"
Q 0 0 1 2 3 VCC (V) 4 5 6
SV00185
RESET
Figure 4.
HCT typical "K" factor as a function of VCC; CX = 10 nF; RX = 10 k to 100 k. Figure 6.
VCC
SV00152
106
Power-up output pulse elimination circuit
REXT = 100 kW 105 50 kW
104 tW ns 103 10 kW
Power-down considerations A large capacitor (CX) may cause problems when powering-down the monostable due to the energy stored in this capacitor. When a system containing this device is powered-down or a rapid decrease of VCC to zero occurs, the monostable may sustain damage, due to the capacitor discharging through the input protection diodes. To avoid this possibility, connect a damping diode (DX) preferably a germanium or Schottky type diode able to withstand large current surges as shown in Figure 7.
2 kW DX 102
0 1 10 102 CEXT (pF) RX 103 104 CX
VCC
SV00141
nREXT/CEXT
Figure 5. Typical output pulse width as a function of the external capacitor values at VCC = 3.3 V and Tamb = 25 C.
SV00154
Figure 7.
Power-down protection circuit
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
TEST CIRCUIT
Vcc
Vl PULSE GENERATOR RT D.U.T.
VO
50 pF CL
RL= 1 k
Test Circuit for Outputs DEFINITIONS
RL = Load resistor CL = Load capacitance includes jig and probe capacitiance RT = Termination resistance should be equal to ZOUT of pulse generators.
TEST tPLH/tPHL
VCC < 2.7 V 2.7 V to 3.6 V 4.5 V
VI VCC 2.7 V VCC
SV00902
Figure 8.
Load circuitry for switching times
2003 Mar 13
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
DIP16: plastic dual in-line package; 16 leads (300 mil); long body
SOT38-1
2003 Mar 13
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
2003 Mar 13
13
Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
SOT338-1
2003 Mar 13
14
Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
SOT403-1
2003 Mar 13
15
Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
REVISION HISTORY
Rev _3 Date 20030313 Description Product data (9397 750 11244). ECN 853-1911 29490 of 07 February 2003. Supersedes Product specification of 1998 Apr 20 (9397 750 04418). Modifications:
* Quick Reference Data: Correct power dissipation formula in Note 1. * Ordering information: delete "North America"column; rename column from "Outside North America" to * AC characteristics, Note 5 (on page 8): correct CEXT value calculation formula for 5 V operation;
add CEXT value calculation formula for 3.3 V operation. _2 19980420 Product specification (9397 750 04418). ECN 853-1911 19290 of 20 April 1998. Supersedes data of 1997 Feb 04. "Order Code".
2003 Mar 13
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Philips Semiconductors
Product data
Dual retriggerable monostable multivibrator with reset
74LV123
Data sheet status
Level
I
Data sheet status [1]
Objective data
Product status [2] [3]
Development
Definitions
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
II
Preliminary data
Qualification
III
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 03-03
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 11244
Philips Semiconductors
2003 Mar 13 17

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