SN74VMEH22501

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SCES357F – JULY 2001 – REVISED FEBRUARY 2010

INPUTS

OUTPUT

MODE

3B

OE

LE

CLKAB

3A

H

X

X

X

Z

Isolation

L

L

H

X

(2)

Latched storage of 3A data

L

L

L

X

(3)

L

H

X

L

L

True transparent

L

H

X

H

H

L

L

↑

L

L

Clocked storage of 3A data

L

L

↑

H

H

(1)

3A-to-3B data flow is shown; 3B-to-3A data flow is similar, but uses CLKBA.

(2)

Output level before the indicated steady-state input conditions were established, provided that CLKAB

was high before LE went low

(3)

Output level before the indicated steady-state input conditions were established

The UBT transceiver can replace any of the functions shown in Table 2.

Table 2. SN74VMEH22501 UBT Transceiver

Replacement Functions

FUNCTION

8 BIT

Transceiver

'245, '623, '645

Buffer/driver

'241, '244, '541

Latched transceiver

'543

Latch

'373, '573

Registered transceiver

'646, '652

Flip-flop

'374, '574

SN74VMEH22501 UBT transceiver replaces all above functions

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