Datasheet

SN74VMEH22501A
www.ti.com SCES3620A –DECEMBER 2004–REVISED FEBRUARY 2010
Table 1. UBT TRANSCEIVER FUNCTION TABLE
(1)
INPUTS
OUTPUT
MODE
3B
OE LE CLKAB 3A
H X X X Z Isolation
L L H X B
0
(2)
Latched storage of 3A data
L L L X B
0
(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. SN74VMEH22501A 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
SN74VMEH22501A UBT transceiver replaces all above functions
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