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SN74VMEH22501 Datasheet(PDF) 4 Page - Texas Instruments

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No. de pieza SN74VMEH22501
Descripción Electrónicos  8 BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1 BIT BUS TRANSCEIVERS WITH SPLIT LVTTL PORT FEEDBACK PATH AND 3 STATE OUTPUTS
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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SN74VMEH22501 Datasheet(HTML) 4 Page - Texas Instruments

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SN74VMEH22501
8BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1BIT BUS TRANSCEIVERS
WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3STATE OUTPUTS
SCES357E − JULY 2001 − REVISED MARCH 2004
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional description for 8-bit UBT transceiver
The 3A and 3B data flow in each direction is controlled by the OE and direction-control (DIR) inputs. When OE
is low, all 3A- or 3B-port outputs are active. When OE is high, all 3A- or 3B-port outputs are in the high-impedance
state.
FUNCTION TABLE
INPUTS
OUTPUT
OE
DIR
OUTPUT
H
X
Z
L
H
3A data to 3B bus
L
L
3B data to 3A bus
The UBT transceiver functions are controlled by latch-enable (LE) and clock (CLKAB and CLKBA) inputs. For
3A-to-3B data flow, the UBT operates in the transparent mode when LE is high. When LE is low, the 3A data
is latched if CLKAB is held at a high or low logic level. If LE is low, the 3A data is stored in the latch/flip-flop on
the low-to-high transition of CLKAB.
The UBT transceiver data flow for 3B to 3A is similar to that of 3A to 3B, but uses CLKBA.
UBT TRANSCEIVER FUNCTION TABLE†
INPUTS
OUTPUT
MODE
OE
LE
CLKAB
3A
OUTPUT
3B
MODE
H
X
X
X
Z
Isolation
L
L
H
X
B0‡
Latched storage of 3A data
L
LL
X
B0§
Latched storage of 3A data
L
H
X
L
L
True transparent
L
HX
H
H
True transparent
L
L
L
L
Clocked storage of 3A data
L
L
H
H
Clocked storage of 3A data
† 3A-to-3B data flow is shown; 3B-to-3A data flow is similar, but uses CLKBA.
‡ Output level before the indicated steady-state input conditions were established,
provided that CLKAB was high before LE went low
§ Output level before the indicated steady-state input conditions were established
The UBT transceiver can replace any of the functions shown in Table 1.
Table 1. 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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