HD74HC640 Datasheet, PDF (5/11 Pages) Hitachi Semiconductor – Octal Bus Transceivers (with 3-state outputs)

HD74HC640, HD74HC643
Switching Characteristics (C_L = 50 pF, Input t_r = t_f = 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
G
Input
Pulse Generator
Zout = 50 Ω
Input
Pulse Generator
Zout = 50 Ω
DIR
S1
A1
B1
Output
1 kΩ _S2
C_L =
50 pF
OPEN
GND
V_CC
TEST
t_PLH / t _PHL
t_ZH/ t _HZ
t_ZL / t _LZ
S2
OPEN
GND
V_CC
Notes : 1. C_L 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 10