HD74HC245_1 Datasheet, PDF (4/8 Pages) Renesas Technology Corp – Octal Bus Transceivers (with 3-state outputs)

HD74HC245
Switching Characteristics
Item
Symbol V_CC (V)
Propagation delay tPHL
2.0
time
4.5
6.0
t_PLH
2.0
4.5
6.0
Output enable time t_ZL
2.0
4.5
6.0
t_ZH
2.0
4.5
6.0
Output disable
time
t_LZ
2.0
4.5
6.0
t_HZ
2.0
4.5
6.0
Output rise/fall
time
t_TLH
2.0
t_THL
4.5
6.0
Input capacitance Cin
—
Ta = 25°C
Min Typ Max
— — 90
— 12 18
— — 15
— — 90
— 10 18
— — 15
— — 150
— 11 30
— — 26
— — 150
— 12 30
— — 26
— — 150
— 16 30
— — 26
— — 150
— 19 30
— — 26
— — 60
— 4 12
— — 10
— 5 10
(C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = –40 to +85°C
Unit
Min
Max
Test Conditions
—
115 ns
—
23
—
20
—
115 ns
—
23
—
20
—
190 ns
—
38
—
33
—
190 ns
—
38
—
33
—
190 ns
—
38
—
33
—
190 ns
—
38
—
33
—
75
ns
—
15
—
13
—
10
pF
Test Circuit
VCC
VCC
G
Input
Pulse Generator
Zout = 50 Ω
DIR
S1
A1
B1
Output
1 K Ω _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
Note : 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 switch.
Rev.2.00 Jan 31, 2006 page 4 of 7