74ABT544PW,112 NXP Semiconductors, 74ABT544PW,112 Datasheet - Page 4

• Manufacturer Part Number: 74ABT544PW,112
• Description: IC TRANSCVR 3ST 8BIT INV 24TSSOP
• Manufacturer: NXP Semiconductors
• Series: 74ABTr

Specifications of 74ABT544PW,112

• Logic Type: Transceiver, Inverting
• Number Of Elements: 1
• Number Of Bits Per Element: 8
• Current - Output High, Low: 32mA, 64mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-2487-5; 935178850112

NXP Semiconductors
6. Functional description
Table 3.
[1]
74ABT544
Product data sheet
Input
OEXX
H
X
L
L
L
L
H = HIGH voltage level;
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition of LEXX or EXX (XX = AB or BA);
L = LOW voltage level;
l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition of LEXX or EXX (XX = AB or BA);
↑ = LOW-to-HIGH clock transition of LEXX or EXX (XX = AB or BA);
NC = no change;
X = don’t care;
Z = high-impedance OFF-state.
Function selection
6.1 Function table
6.2 Description
EXX
X
H
↑
L
L
L
The 74ABT544 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 (EAB) input, the
A-to-B latch enable (LEAB) input and the A-to-B output enable (OEAB) input are all LOW,
the A-to-B path is transparent.
A subsequent LOW-to-HIGH transition of the LEAB 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
OEAB both LOW, the 3-state B output 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 EBA, LEBA, and OEBA inputs.
[1]
X
L
H
LEXX
X
L
↑
All information provided in this document is subject to legal disclaimers.
Rev. 05 — 20 May 2010
An or Bn
X
X
h
l
h
l
H
L
X
Octal latched transceiver with dual enable; 3-state
Output
Bn or An
Z
Z
Z
Z
L
H
L
H
NC
74ABT544
Status
disabled
disabled + latch
latch + display
transparent
hold
© NXP B.V. 2010. All rights reserved.
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