HD74HCT640/HD74HCT643 Octal Bus Transceivers (with 3-state outputs) Description Both the HD74HCT640 and the HD74HCT643 have one active low enable input (G), and a direction control (DIR). When the DIR input is high, data flows from the A inputs to the B outputs. When DIR is low, data flows from B to A. The HD74HCT640 transfers inverted data from one bus to the other. The HD74HCT643 transfers inverted data from the A bus to the B bus and non-inverted data from the B bus to the A bus. Features • • • • • • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A to B) = 14.5 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 4.5 to 5.5 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Control Input Operation G DIR HD74HCT640 HD74HCT643 L L B data to A bus B data to A bus L H A data to B bus A data to B bus H X Isolation Isolation HD74HCT640/HD74HCT643 Pin Arrangement HD74HCT640 DIR 1 20 VCC A1 2 19 Enable G A2 3 18 B1 A3 4 17 B2 A4 5 16 B3 A5 6 15 B4 A6 7 14 B5 A7 8 13 B6 A8 9 12 B7 GND 10 11 B8 (Top view) 2 HD74HCT640/HD74HCT643 HD74HCT643 DIR 1 20 VCC A1 2 19 Enable G A2 3 18 B1 A3 4 17 B2 A4 5 16 B3 A5 6 15 B4 A6 7 14 B5 A7 8 13 B6 A8 9 12 B7 GND 10 11 B8 (Top view) Block Diagram HD74HCT640 G DIR VCC A B VCC To 7 other inverters To 7 other inverters 3 HD74HCT640/HD74HCT643 HD74HCT643 G DIR VCC A B VCC To 7 other inverters To 7 other inverters Absolute Maximum Ratings Item Symbol Rating Unit Supply voltage range VCC –0.5 to +7.0 V Input voltage VIN –0.5 to VCC + 0.5 V Output voltage VOUT –0.5 to VCC + 0.5 V DC current drain per pin I OUT ±35 mA DC current drain per VCC, GND I CC, I GND ±75 mA DC input diode current I IK ±20 mA DC output diode current I OK ±20 mA Power dissipation per package PT 500 mW Storage temperature Tstg –65 to +150 °C 4 HD74HCT640/HD74HCT643 DC Characteristics Ta = –40 to +85°C Ta = 25°C Test Conditions Item Symbol Min Typ Max Min Max Unit VCC (V) Input voltage VIH 2.0 — — — V 4.5 to 5.5 VIL — — 0.8 — 0.8 V 4.5 to 5.5 VOH 4.4 — — 4.4 — V 4.5 Vin = VIH or VIL I OH = –20 µA 4.18 — — 4.13 — 4.5 I OH = –6 mA — — 0.1 — 0.1 — — 0.26 — 0.33 Output voltage VOL 2.0 V 4.5 Vin = VIH or VIL I OL = 20 µA 4.5 I OL = 6 mA Off-state output current I OZ — — ±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL, Vout = VCC or GND Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND Quiescent current I CC — — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C Test Conditions Min Typ Max Min Max Unit VCC (V) Propagation delay t PLH — 13 18 — 23 ns 4.5 time t PHL — 16 18 — 23 Output enable t ZH — 16 46 — 58 time t ZL — 16 46 — 58 Output disable t HZ — 17 43 — 54 time t LZ — 21 43 — 54 Output rise/fall time t TLH t THL — 4 12 — 15 ns 4.5 Input capacitance Cin — 5 10 — 10 pF — Item Symbol 4.5 ns 4.5 4.5 ns 4.5 4.5 5 Unit: mm 24.50 25.40 Max 6.30 11 1 7.00 Max 20 10 1.30 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 1.27 Max 2.54 Min 5.08 Max 0.89 7.62 + 0.11 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-20N — Conforms 1.26 g Cautions 1. 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