MB2543 NXP Semiconductors, MB2543 Datasheet - Page 3

• Manufacturer Part Number: MB2543
• Manufacturer: NXP Semiconductors

Philips Semiconductors Advanced BiCMOS Products
FUNCTIONAL DESCRIPTION
The MB2543 contains two sets of eight
D-type latches, with separate control pins for
each set. Using data flow from A to B as an
example, when the A-to-B Enable (nEAB)
input and the A-to-B Latch Enable (nLEAB)
input are Low the A-to-B path is transparent.
PIN DESCRIPTION
FUNCTION TABLE
H = High voltage level
h = High voltage level one set-up time prior to the Low-to-High transition of nLEXX or nEXX (XX = AB or BA)
L = Low voltage level
l
X = Don’t care
NC= No change
Z = High impedance or “off” state
August 23, 1993
Dual octal latched transceivers with dual enable
(3-State)
= Low voltage level one set-up time prior to the Low-to-High transition of nLEXX or nEXX (XX = AB or BA)
= Low-to-High transition of nLEXX or nEXX (XX = AB or BA)
nOEXX
42, 41, 39, 38, 37, 36, 35, 34,
33, 32, 31, 29, 28, 27, 25, 24
8, 9, 10, 11, 12, 13, 15, 16
H
X
L
L
L
L
L
L
L
50, 51, 1, 2, 3, 5, 6, 7,
PIN NUMBER
47, 46, 20, 21
49, 44, 18, 23
48, 45, 19, 22
14, 26, 40, 52
4, 17, 30, 43
nEXX
H
X
L
L
L
L
L
INPUTS
nLEXX
X
X
H
L
L
L
L
A subsequent Low-to-High transition of the
nLEAB signal puts the A data into the latches
where it is stored and the B outputs no longer
change with the A inputs. With EAB and
nOEAB both Low, the 3-State B output
1OEAB, 1OEBA,
2OEAB, 2OEBA
1LEAB, 1LEBA,
2LEAB, 2LEBA
1EAB, 1EBA,
2EAB, 2EBA
1A0 – 1A7,
1B0 – 1B7,
2A0 – 2A7
2B0 – 2B7
SYMBOL
nAx or nBx
GND
V
CC
H
X
X
h
h
L
X
l
l
3
nBx or nAx
OUTPUTS
Data inputs/outputs
Data inputs/outputs
A to B / B to A Output Enable inputs (active-Low)
A to B / B to A Enable inputs (active-Low)
A to B / B to A Latch Enable inputs (active-Low)
Ground (0V)
Positive supply voltage
NC
H
H
Z
Z
Z
Z
L
L
Disabled
Disabled
Disabled + Latch
Latch + Display
Transparent
Hold
buffers are active and display the data
present at the outputs of the A latches.
Control of data flow from B to A is similar, but
using the nEBA, nLEBA, and nOEBA inputs.
NAME AND FUNCTION
STATUS
Product specification
MB2543