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PI74LCX646 PI74LCX652
Product Features
* Functionally compatible with FCT3, LVT, and 74 series 646 and 652 families of products * Tri-State outputs * 5V Tolerant inputs and outputs * 2.0V-3.6V VCC supply operation * Balanced sink and source output drives (24 mA) * Low ground bounce outputs * Supports live insertion * ESD Protection exceeds 2000V, Human Body Model 200V, Machine Model * Packages available: - 24-pin 209-mil wide plastic SSOP (H) - 24-pin 173-mil wide plastic TSSOP (L) - 24-pin 150-mil wide plastic QSOP (Q) - 24-pin 300-mil wide plastic SOIC (S)
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Fast CMOS 3.3V 8-Bit Registered Transceiver Product Description
Pericom Semiconductor's PI74LCX series of logic circuits are produced in the Company's advanced 0.6 micron CMOS technology, achieving industry leading speed grades. The PI74LCX646 and PI74LCX652 are designed with a bus transceiver with 3-state D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. The PI74LCX652 utilizes GAB and GBA signals to control the transceiver functions. The PI74LCX646 uses the enable control (G) and direction pins (DIR) to control the transceiver functions. SAB and SBA control pins are used to select either real-time or stored data transfer. The circuitry used for select control will eliminate the typical decoding glitch that occurs in a multiplexer during the transition between real-time and stored data. A low input level selects real-time data and a high selects stored data. The PI74LCX646 and PI74LCX652 can be driven from either 3.3V or 5.0V devices allowing this device to be used as a translator in a mixed 3.3/5.0V system.
Logic Block Diagram
PI74LPT652 ONLY GBA PI74LPT646 ONLY G GAB
DIR CPBA SBA CPAB SAB
1 OR 8 CHANNELS
B REG 0D C0 B0
A REG A0 0D C0
TO 7 OTHER CHANNELS
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PI74LCX646 PI74LCX652 3.3V 8-BIT REGISTERED TRANSCEIVER
PI74LCX646 Product Pin Configuration
CPAB SAB DIR A0 A1 A2 A3 A4 A5 A6 A7 GND
PI74LCX652 Product Pin Configuration Product Pin Description
CPAB SAB GAB A0 A1 A2 A3 A4 A5 A6 A7 GND
1 24 2 23 3 22 4 24-PIN 21 H24 20 5 L24 6 19 Q24 18 7 S24 8 17 9 16 10 15 11 14 12 13
VCC CPBA SBA G B0 B1 B2 B3 B4 B5 B6 B7
1 24 2 23 3 22 4 24-PIN 21 H24 20 5 L24 6 19 Q24 18 7 S24 8 17 9 16 10 15 11 14 12 13
VCC CPBA SBA GBA B0 B1 B2 B3 B4 B5 B6 B7
Pin Name A0-A7 B0-B7 CPAB, CPBA SAB, SBA DIR, G GAB, GBA GND VCC
Description Data Register A Inputs Data Register B Outputs Data Register B Inputs Data Register A Outputs Clock Pulse Inputs Output Data Source SelectInputs Output Enable Inputs (LCX646) Output Enable Inputs (LCX652) Ground Power
PI74LCX646 Truth Table
Inputs DATA I/O(2)
Function/Operation Isolation Store A and B Data Real Time B Data to A Bus Stored B Data to A Bus Real Time A Data to B Bus Stored A Data to B Bus
G H H L L L L
DIR X X L L H H
CPAB H or L X X X H or L
CPBA H or L X H or L X X
SAB X X X X L H
SBA X X L H X X
A0-A7 Input Output Input
B0-B7 Input Input Output
PI74LCX652 Truth Table
Inputs DATA I/O(2)
Function/Operation Isolation Store A and B Data Store A, Hold B Store A in Both Registers Hold A, Store B Store B in Both Registers Real Time B Data to A Bus Stored B Data to A Bus Real Time A Data to B Bus Stored A Data to B Bus Stored A Data to B Bus and Stored B Data to A Bus
GAB L L X H L L L L H H H
GBA H H H H X L L L H H L
CPAB H or L H or L X X X H or L H or L
CPBA H or L H or L X H or L X X H or L
SAB X X X X(2) X X X X L H H
SBA X X X X X X(2) L H X X H
A0-A7 Input Input Input Unspecified(1) Output Output Input Output
B0-B7 Input Unspecified(1) Output Input Input Input Output Output
Notes: 1. The data output functions may be enabled or disabled by various signals at the GAB or GBA inputs. Data input functions are always enabled, i.e., data at the bus pins will be stored on every low-to-high transition on the clock inputs. 2. Select control = L: clocks can occur simultaneously. Select control = H: clocks must be staggered to load both registers. H = High Voltage Level; L = Low Voltage Level; X = Don't Care; = LOW-to-HIGH transition
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PI74LCX646 PI74LCX652 3.3V 8-BIT REGISTERED TRANSCEIVER
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ............................................................. -65C to +150C Ambient Temperature with Power Applied ............................ -40C to +85C Supply Voltage to Ground Potential (Inputs & Vcc Only) ...... -0.5V to +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) .. -0.5V to +7.0V DC Input Voltage .................................................................... -0.5V to +7.0V DC Output Current .............................................................................. 120 mA Power Dissipation .................................................................................... 1.0W Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Recommended Operating Conditions
Symbol VCC Parameter Supply Voltage Operating Data Retention VI VO Input Voltage Output Voltage HIGH or LOW State TRI-State IOH/IOL Output Current VCC = 3.0V-3.6V VCC = 2.7V TA Free-Air Operating Temperature Input Edge Rate V = 0.8V-2.0V, VCC = 3.0V Min. 2.0 1.5 0 0 0 -40 0 Max. 3.6 3.6 5.5 VCC 5.5 24 12 +85 10 mA C ns/V V Units
t/V
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Capacitance
Parameters Description CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance Test Conditions VCC = Open, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC, F = 10 MHz Typ. 7 8 25 pF Units
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PI74LCX646 PI74LCX652 3.3V 8-BIT REGISTERED TRANSCEIVER
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 2.7V to 3.6V)
Parameters Description VIH VIL VOH Input HIGH Voltage Input LOW Voltage Output HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = 2.7-3.6 VCC = 2.7 VCC = 3.0 IOH = -0.1mA IOH = -12mA IOH = -18mA IOH = -24mA VOL Output LOW Voltage VCC = 2.7-3.6 VCC = 2.7 VCC = 3.0 IOL = 0.1mA IOL = 12mA IOL = 16mA IOL = 24mA VIK II IOZ IOFF ICC Clamp Diode Voltage Input Leakage Current Tri-State Output Leakage Power Down Disable Quiescent Power Supply Current Quiescent Power Supply Current TTL Inputs HIGH VCC = Min., IIN = -18mA 0 VI 5.5V 0 VO 5.5V VI = VIH or VIL Vcc = 2.7-3.6 VCC = 2.7-3.6 Min. 2.0 -- VCC-0.2 2.2 2.4 2.2 -- -- -- -- -- -- -- -- Typ(2) -- -- -- -- -- -- -- -- -- -- -0.7 -- -- -- 0.1 Max. -- 0.8 -- -- -- -- 0.2 0.4 0.4 0.55 -1.2 5 5 10 10 500 A V Units
VCC = 0V, VIN or VOUT 5.5V VCC = Max. VCC = Max. VIN = GND or VCC VIN = VCC - 0.6V(3)
ICC
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 3.3V, +25C ambient. 3. Per TTL driven input; all other inputs at VCC or GND.
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Dynamic Switching Characteristics (TA = +25C)
Parameters VOLP VOLV Description Dynamic LOW Peak Voltage Dynamic LOW Valley Voltage Test Conditions(1) VCC = 3.3V, CL = 50pF VIH = 3.3V, VIL = 0V VCC = 3.3V, CL = 50pF VIH = 3.3V, VIL = 0V Typical 0.8 0.8 Units V V
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PI74LCX646 PI74LCX652 3.3V 8-BIT REGISTERED TRANSCEIVER
Switching Characteristics over Operating Range
VCC = 3.3V 0.3V Parameters fMAX tPHL tPLH tPHL tPLH tPHL tPLH tPZL tPZH tPLZ tPHZ
TS TH TW
VCC = 2.7V Min. 1.5 1.5 1.5 1.5 1.5 2.5 1.5 3.3 Max. 8.0 9.5 9.5 9.5 ns 9.5
Description Maximum Clock Frequency Propagation Delay Bus to Bus Propagation Delay Clock to Bus Propagation Delay Select to Bus Output Enable Time Output Disable Time Setup Time Hold Time Pulse Width Output to Output Skew(1)
Conditions CL = 50pF RL = 500
Min. 150 1.5 1.5 1.5 1.5 1.5 2.5 1.5 3.3
Max. 7.0 8.5 8.5 8.5 8.5 1.0
Units MHz
tSK(0)
Note: 1. Skew between any two outputs, of the same package, switching in the same direction.
Note: 1. Measured with n-1 outputs switching from High-to-Low or Low-to-High. The remaining output is measured in the LOW state.
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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