Document
HD74HC640, HD74HC643
Octal Bus Transceivers (with 3-state outputs)
REJ03D0637-0200 (Previous ADE-205-517)
Rev.2.00 Mar 30, 2006
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) • Ordering Information
Part Name
Package Type
Package Code (Previous Code)
Package Abbreviation
HD74HC640P
DILP-20 pin
PRDP0020AC-B (DP-20NEV)
P
HD74HC640FPEL SOP-20 pin (JEITA)
PRSP0020DD-B
(FP-20DAV)
FP
HD74HC640RPEL SOP-20 pin (JEDEC)
HD74HC643RPEL
PRSP0020DC-A RP (FP-20DBV)
Note: Please consult the sales office for the above package availability.
Taping Abbreviation (Quantity)
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
Function Table
Control Inputs G DIR LL LH HX H : high level L : low level X : irrelevant
HD74HC640 B data to A bus A data to B bus
Isolation
Operation
HD74HC643 B data to A bus A data to B bus
Isolation
Rev.2.00 Mar 30, 2006 page 1 of 10
HD74HC640, HD74HC643
Pin Arrangement
HD74HC640
HD74HC643
DIR 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9
GND 10
(Top View)
20 VCC 19 Enable G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8
DIR 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9
GND 10
(Top View)
20 VCC 19 Enable G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8
Rev.2.00 Mar 30, 2006 page 2 of 10
HD74HC640, HD74HC643
Logic Diagram
HD74HC640 G
DIR
A
VCC VCC
B
HD74HC643 G
DIR
A
To 7 Other Inverters
To 7 Other Inverters
VCC VCC
B
To 7 Other Inverters
To 7 Other Inverters
Rev.2.00 Mar 30, 2006 page 3 of 10
HD74HC640, HD74HC643
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Supply voltage range Input / Output voltage Input / Output diode current Output current VCC, GND current Power dissipation Storage temperature
VCC VIN, VOUT
IIK, IOK IO
ICC or IGND PT Tstg
–0.5 to 7.0 –0.5 to VCC +0.5
±20 ±35 ±75 500 –65 to +150
V V mA mA mA mW °C
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time.
Recommended Operating Conditions
Item
Symbol
Ratings
Supply voltage
VCC 2 to 6
Input / Output voltage Operating temperature
VIN, VOUT Ta
0 to VCC –40 to 85
Input rise / fall time*1
0 to 1000 tr, tf 0 to 500
0 to 400
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Unit V V °C
ns
Conditions
VCC = 2.0 V VCC = 4.5 V VCC = 6.0 V
Electrical Characteristics
Item Input voltage
Output voltage
Off-state output current Input current Quiescent supply current
Symbol VIH VIL VOH
VOL
IOZ Iin ICC
VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 6.0
6.0 6.0
Ta = 25°C Min Typ Max 1.5 — — 3.15 — — 4.2 — — — — 0.5 — — 1.35 — — 1.8 1.9 2.0 — 4.4 4.5 — 5.9 6.0 — 4.18 — — 5.68 — — — 0.0 0.1 — 0.0 0.1 — 0.0 0.1 — — 0.26 — — 0.26 — — ±0.5
— — ±0.1 — — 4.0
Ta = –40 to+85°C
Min Max Unit
Test Conditions
1.5 — V
3.15 —
4.2 —
— 0.5 V
— 1.35
— 1.8
1.9 — V Vin = VIH or VIL IOH = –20 µA
4.4 —
5.9 —
4.13 —
IOH = –6 mA
5.63 —
IOH = –7.8 mA
— 0.1 V Vin = VIH or VIL IOL = 20 µA
— 0.1
— 0.1
— 0.33
IOL = 6 mA
— 0.33
IOL = 7.8 mA
— ±5.0 µA Vin = VIH or VIL, Vout = VCC or GND
— ±1.0 µA Vin = VCC or GND
— 40 µA Vin = VCC or GND, Iout = 0 µA
Rev.2.00 Mar 30, 2006 page 4 of 10
HD74HC640, HD74HC643
Switching Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Item Propagation delay time
Output enable time
Output disable time
Output rise/fall time Input capacitance
Symbol VCC (V) tPHL 2.0 4.5 6.0 tPLH 2.0 4.5 6.0 tZL 2.0 4.5 6.0 tZH 2.0 4.5 6.0 tLZ 2.0 4.5 6.0 tHZ 2.0 4.5 6.0 tTLH 2.0 tTHL 4.5 6.0 Cin —
Ta = 25°C Min Typ Max — — 90 — 12 18 — — 15 — — 90 — 12 18 — — 15 — — 230 — 15 46 — — 39 — — 230 — 15 46 — — 39 — — 215 — 17 43 — — 37 — — 215 — 17 43 — — 37 — — 60 — 4 12 — — 10 — 5 10
Ta = –40 to +85°C Min Max Unit — 115 ns — 23 — 20 — 115 ns — 23 — 20 — 290 ns — 58 — 49 — 290 ns — 58 — 49 — 270 ns — 54 — 46 — 270 ns — 54 — 46 — 75 ns — 15 — 13 — 10 pF
Test Circuit
HD74HC640
VCC
VCC
Test Conditions
Input
Pulse Generator Zout = 50 Ω Input
Pulse Generator Zout = 50 Ω
See Function Table
G DIR
S1 A1 B1
Output
1 kΩ S2 CL = 50 pF
OPEN GND VCC
TEST
tPLH / t PHL tZH/ t HZ tZL / t LZ
S2 OPEN GND
VCC
Notes : 1. CL includes probe and jig capacitance. 2. A2–B2, A3–B3, A4–B4, A5–B5, A6–B6, A7–B7, A8–B8 are identical to above load circuit.
3. S1 is a input / output swich.
Rev.2.00 Mar 30, 2006 page 5 of 1.