HD74BC240A Datasheet, PDF (5/8 Pages) Hitachi Semiconductor – Octal Buffers/Line Drivers With 3 State Outputs

Switching Test Method (C_L = 50 pF)
Item
Propagation delay time
Output enable time
Output disable time
Input capacitanse
Output capacitance
Symbol
Ta = 25°C
V_CC = 5.0 V
Min
Max
t _PLH
3.0
6.0
t _PHL
3.0
6.0
t _ZH
3.0
8.0
t _ZL
3.0
8.0
t _HZ
3.0
7.0
t _LZ
3.0
7.0
C_IN
3.0(Typ)
C_O
15.0(Typ)
HD74BC240A
Ta = –40 to 85°C
V_CC = 5.0 V ±10%
Min
Max
3.0
7.0
3.0
7.0
3.0
10.0
3.0
10.0
3.0
9.0
3.0
9.0
—
—
Unit Test Conditions
ns See under figure
ns
ns
pF V_IN = V_CC or GND
pF V_O = V_CC or GND
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
VCC
Output
G
1Y1
1A1
1A2
500 Ω
C_L =
450 Ω
50 pF
50 Ω Scope
Output
1A3
1Y2
Same as above
load circuit
1A4
1Y3
Same as above
load circuit
1Y4
Same as above
load circuit
Notes:
1. C_L includes probe and jig capacitance.
2. 2G, 2A1-2A4 to 2Y1-2Y4 are identical to above load circuit.
3. Open: t_PLH, t_PHL, t_ZH, t_HZ
7 V: t_ZL, t_LZ
*3
OPEN
7V
5