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TC74LVX240,244F/FT
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74LVX240F,TC74LVX240FT TC74LVX244F,TC74LVX244FT
Octal Bus Buffer TC74LVX240 Inverted, 3-State Outputs TC74LVX244 Non-Inverted, 3-State Outputs
The TC74LVX240,244F/ FT is a high-speed CMOS OCTAL BUS BUFFER fabricated using silicon gate CMOS technology. Designed for use in 3-V systems, it achieves high-speed operation while maintaining the CMOS low power dissipation. This device is suitable for low-voltage and battery operated systems. The TC74LVX240 is an inverting 3-state buffer while the TC74LVX244 is non-inverting. Both devices have two active-low output enables. These devices are designed to be used in such applications as 3-state memory address drivers. An input protection circuit ensures that 0 to 5.5V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.
TC74LVX240F, TC74LVX244F
TC74LVX240FT, TC74LVX244FT
Features
* * * * * * * High-speed: tpd = 4.7 ns (typ.) (VCC = 3.3 V) Low power dissipation: ICC = 4 A (max) (Ta = 25C) Input voltage level: VIL = 0.8 V (max) (VCC = 3 V) VIH = 2.0 V (min) (VCC = 3 V) Power-down protection provided on all inputs Balanced propagation delays: tpLH - tpHL Low niose: VOLP = 0.8 V (max) Pin and function compatible with 74HC240/244 Weight SOP20-P-300-1.27A TSSOP20-P-0044-0.65A : 0.22 g (typ.) : 0.08 g (typ.)
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TC74LVX240,244F/FT
Pin Assignment (top view)
TC74LVX240 TC74LVX244 20 19 18 17 16 15 14 13 12 11 VCC
1G
1A1 2Y 4 1A2 2Y3 1A3
1 2 3 4 5 6 7 8 9 10
1G
1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1
1 2 3 4 5 6 7 8 9
20 19 18 17 16 15 14 13 12 11
VCC
2G
1Y1 2A4 1Y 2 2A3
2G
1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1
2Y2
1A4 2 Y1 GND
1Y 3
2A2 1Y 4 2A1
GND 10
IEC Logic Symbol
TC74LVX240 EN (18) (16) (14) (12) 1Y1 1Y 2
1G
1G
(1) (2) (4) (6) (8)
(1) (2) (4) (6) (8)
TC74LVX244 EN (18) (16) (14) (12) 1Y1 1Y2 1Y3 1Y4
1A1 1A2 1A3 1A4
1A1 1A2 1A3 1A4
1Y 3 1Y 4
2G
(19) (11) (13) (15) (17)
EN (9) (7) (5) (3) 2 Y1 2Y2
2G
(19) (11) (13) (15) (17)
EN (9) (7) (5) (3) 2Y1 2Y2 2Y3 2Y4
2A1 2A2 2A3 2A4
2Y3 2Y 4
2A1 2A2 2A3 2A4
Truth Table
Inputs Outputs
G
L L H
An
L H X
Yn (244)
L H Z
Y n ( 240 ) H L Z
X: Don't care Z: High impedance
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TC74LVX240,244F/FT
Absolute Maximum Ratings (Note)
Characteristics Supply voltage range DC input voltage DC output voltage Input diode current Output diode current DC output current DC VCC/ground current Power dissipation Storage temperature Symbol VCC VIN VOUT IIK IOK IOUT ICC PD Tstg Rating
-0.5 to 7.0 -0.5 to 7.0 -0.5 to VCC + 0.5 -20 20 25 75
Unit V V V mA mA mA mA mW C
180
-65 to 150
Note: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction. Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook ("Handling Precautions"/"Derating Concept and Methods") and individual reliability data (i.e. reliability test report and estimated failure rate, etc).
Operating Ranges (Note)
Characteristics Supply voltage Input voltage Output voltage Operating temperature Input rise and fall time Symbol VCC VIN VOUT Topr dt/dv Rating 2.0 to 3.6 0 to 5.5 0 to VCC
-40 to 85
Unit V V V C ns/V
0 to 100
Note: The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND.
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TC74LVX240,244F/FT
Electrical Characteristics
DC Characteristics
Characteristics Symbol Test Condition VCC (V) 2.0 H-level Input voltage L-level VIL

Ta = 25C Min 1.5 2.0 2.4

Ta = -40 to 85C Max

Unit
Typ.

Min 1.5 2.0 2.4

Max

VIH
3.0 3.6 2.0 3.0 3.6
0.5 0.8 0.8

0.5 0.8 0.8

V
H-level Output voltage L-level
VOH
IOH = -50 A VIN = VIH IOH = -50 A or VIL IOH = -4 mA VIN = VIH IOL = 50 A or VIL IOL = 4 mA VIN = VIH or VIL VOUT = VCC or GND VIN = 5.5 V or GND VIN = VCC or GND IOL = 50 A
2.0 3.0 3.0 2.0 3.0 3.0 3.6 3.6 3.6
1.9 2.9 2.58

2.0 3.0
1.9 2.9 2.48

0 0

0.1 0.1 0.36
0.25 0.1
0.1 0.1 0.44
2.5 1.0
V
VOL
3-State output Off-state current Input leakage current Quiescent supply current
IOZ IIN ICC
A A A
4.0
40.0
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TC74LVX240,244F/FT
AC Characteristics (input: tr = tf = 3 ns)
Characteristics Symbol Test Condition VCC (V) tpLH
Ta = 25C CL (pF) 15 50 15 50 15 50 15 50 15 50 15 50 50 50 50 50 (Note 2)
Ta = -40 to 85C Max 10.1 13.6 6.2 9.7 11.4 14.9 7.1 10.6 13.8 17.3 8.8 12.3 16.0 11.4 1.5 1.5 10

Unit
Min

Typ. 5.7 8.2 4.3 6.8 6.1 8.6 4.7 7.2 7.1 9.6 5.5 8.0 11.6 9.7

Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0

Max 12.5 16.0 7.5 11.0 13.5 17.0 8.5 12.0 16.5 20.0 10.5 14.0 19.0 13.0 1.5 1.5 10

Propagation delay time (TC74LVX240)
2.7
ns
tpHL
3.3 0.3
Propagation delay time (TC74LVX244)
tpLH
2.7
ns
tpHL
3.3 0.3
tpZL Output enable time tpZH tpLZ tpHZ tosLH tosHL CIN COUT CPD TC74LVX240 TC74LVX244 RL = 1 k
2.7
ns
3.3 0.3 2.7 3.3 0.3 2.7 3.3 0.3
Output disable time
RL = 1 k
ns
Output to output skew Input capacitance Output capacitance Power dissipation capacitance (Note 3)
(Note 1)
ns pF pF pF
4 6 17 19
Note 1: Parameter guaranteed by design. (tosLH = |tpLHm - tpLHn|, tosHL = |tpHLm - tpHLn|) Note 2: Parameter guaranteed by design. Note 3: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption. Average operating current can be obtained by the equation: ICC (opr) = CPDVCCfIN + ICC/8 (per bit)
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TC74LVX240,244F/FT
Noise Characteristics (Ta = 25C, input: tr = tf = 3 ns, CL = 50 pF)
Characteristics Quiet output maximum dynamic VOL Quiet output minimum dynamic VOL Minimum high level dynamic input voltage VIH Maximum low level dynamic input voltage VIL Symbol VOLP VOLV VIHD VILD Test Condition

VCC (V) 3.3 3.3 3.3 3.3
Typ. 0.5
-0.5
Limit 0.8
-0.8
Unit V V V V
2.0 0.8
Input Equivalent Circuit
INPUT
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TC74LVX240,244F/FT
Package Dimensions
Weight: 0.22 g (typ.)
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TC74LVX240,244F/FT
Package Dimensions
Weight: 0.08 g (typ.)
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TC74LVX240,244F/FT
RESTRICTIONS ON PRODUCT USE
* The information contained herein is subject to change without notice.
20070701-EN GENERAL
* TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer's own risk. * The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties. * Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations.
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