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HD74HC643

Hitachi Semiconductor
Part Number HD74HC643
Manufacturer Hitachi Semiconductor
Description Octal Bus Transceivers
Published Mar 23, 2005
Detailed Description HD74HC640/HD74HC643 Octal Bus Transceivers (with 3-state outputs) Description Each device has an active enable G and a ...
Datasheet PDF File HD74HC643 PDF File

HD74HC643
HD74HC643

Overview
HD74HC640/HD74HC643 Octal Bus Transceivers (with 3-state outputs) Description Each device has an active enable G and a direction control input, DIR.
when DIR is high, data flows from the A inputs to the B outputs.
When DIR is low, data flows from the B inputs to the A outputs.
The HD74HC640 transfers inverted data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from the B bus to the A bus.
Features • • • • • High Speed Operation: tpd = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Control Inputs G L L H DIR L H X Operation HD74HC640 B data to A bus A data to B bus Isolation HD74HC643 B data to A bus A data to B bus Isolation HD74HC640/HD74HC643 Pin Arrangement HD74HC640 DIR A1 A2 A3 A4 A5 A6 A7 A8 1 2 3 4 5 6 7 8 9 20 VCC 19 Enable G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8 GND 10 (Top View) 2 HD74HC640/HD74HC643 HD74HC643 DIR A1 A2 A3 A4 A5 A6 A7 A8 1 2 3 4 5 6 7 8 9 20 VCC 19 Enable G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8 GND 10 (Top View) Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage Output current DC current drain per VCC , GND DC input diode current DC output diode current Power Dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating –0.
5 to +7.
0 –0.
5 to VCC + 0.
5 –0.
5 to VCC + 0.
5 ±35 ±75 ±20 ±20 500 –65 to +150 Unit V V V mA mA mA mA mW °C 3 HD74HC640/HD74HC643 Block Diagram HD74HC640 G DIR VCC A B VCC To 7 Other Inverters To 7 Other Inverters 4 HD74HC640/HD74HC643 HD74HC643 G DIR VCC A B VCC To 7 Other Inverters To 7 Other Inverters 5 HD74HC640/HD74HC643 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.
3 1.
35 1.
8 — — — — — 0.
1 0.
1 0.
1 0.
33 0.
33 ±5.
0 ±1.
0 40 µA µA ...


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