MC74HC640A Motorola, MC74HC640A Datasheet - Page 4

• Manufacturer Part Number: MC74HC640A
• Description: Octal 3-State Inverting Bus Transeceiver
• Manufacturer: Motorola

MOTOROLA
MC54/74HC640A
OUTPUT
A OR B
B OR A
INPUT
* Includes all probe and jig capacitance
t PHL
t THL
DEVICE
UNDER
TEST
10%
50%
90%
Figure 1.
90%
50%
Figure 3.
t r
10%
OUTPUT
TEST POINT
C L *
t f
t PLH
t TLH
SWITCHING WAVEFORMS
V CC
GND
tTEST CIRCUITS
4
DIRECTION
OUTPUT
ENABLE
A OR B
A OR B
DEVICE
UNDER
TEST
* Includes all probe and jig capacitance
50%
OUTPUT
50%
50%
TEST POINT
t PZH
t PZL
Figure 2.
Figure 4.
C L *
1 k
t PHZ
t PLZ
High–Speed CMOS Logic Data
CONNECT TO V CC WHEN
CONNECT TO GND WHEN
TESTING t PLZ AND t PZL .
50%
TESTING t PHZ AND t PZH .
10%
90%
DL129 — Rev 6
V CC
GND
V CC
GND
HIGH
IMPEDANCE
V OL
V OH
HIGH
IMPEDANCE