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SN74VMEH22501A-EP bảng dữ liệu(PDF) 4 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  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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SN74VMEH22501A-EP bảng dữ liệu(HTML) 4 Page - Texas Instruments

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SN74VMEH22501AEP
8BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1BIT BUS TRANSCEIVERS
WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3STATE OUTPUTS
SCES625 − FEBRUARY 2005
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. SN74CVMEH22501A-EP 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
SN74CVMEH22501A-EP UBT transceiver
replaces all above functions


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