N74F543DB 查看數據表（PDF） - Philips Electronics
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N74F543DB Datasheet PDF : 12 Pages
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Philips Semiconductors
Octal registered transceiver, non-inverting (3-State)
Product data sheet
74F543
FEATURES
• Combines74F245 and 74F373 type functions in one chip
• 8-bit octal transceiver with D-type latch
• Back-to-back registers for storage
• Separate controls for data flow in each direction
• A outputs sink 20 mA and source 3 mA
• B outputs sink 64 mA and source 15 mA
• 3-State outputs for bus-oriented applications
• Available in SSOP Type II package
DESCRIPTION
The 74F543 Octal Registered Transceiver contains two sets of
D-type latches for temporary storage of data flowing in either
direction. Separate Latch Enable (LEAB, LEBA) and Output Enable
(OEAB, OEBA) inputs are provided for each register to permit
independent control of inputting and outputting in either direction of
data flow. The A outputs are guaranteed to sink 24 mA, while the
B outputs are rated for 64 mA.
FUNCTIONAL DESCRIPTION
The 74F543 contains two sets of eight D-type latches, with separate
input and controls for each set. For data flow from A to B, for
example, the A-to-B Enable (EAB) input must be LOW in order to
enter data from A0 - A7 or take data from B0 - B7, as indicated in
the Function Table. With EAB LOW, a LOW signal on the A-to-B
Latch Enable (LEAB) input makes the A-to-B latches transparent; a
subsequent LOW-to-HIGH transition for the LEAB signal puts the
A latches in the storage mode and their 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.
TYPE
74F543
TYPICAL
PROPAGATION
DELAY
6.0 ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
80 mA
ORDERING INFORMATION
Commerical range: VCC = 5 V ± 10 %; Tamb = 0 °C to +70 °C
Type number
Package
Name
Description
N74F543D
SO24
plastic small outline package; 24 leads; body width 7.5 mm
N74F543DB
SSOP24
plastic shrink small outline pacakge; 24 leads; body width 5.3 mm
N74F543N
DIP24
plastic dual in-line package; 24 leads (300 mil)
Version
SOT137-1
SOT340-1
SOT222–1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
A0 - A7
Port A, 3-State inputs
3.5/1.0
B0 - B7
Port B, 3-State inputs
3.5/1.0
OEAB
A-to-B Output Enable input (Active LOW)
1.0/1.0
OEBA
B-to-A Output Enable input (Active LOW)
1.0/1.0
EAB
A-to-B Enable input (Active LOW)
1.0/2.0
EBA
B-to-A Enable input (Active LOW)
1.0/2.0
LEAB
A-to-B Latch Enable input (Active LOW)
1.0/1.0
LEBA
B-to-A Latch Enable input (Active LOW)
1.0/1.0
A0 - A7
Port A, 3-State outputs
150/40
B0 - B7
Port B, 3-State outputs
750/106.7
NOTE: One (1.0) FAST Unit Load is defined as: 20 µA in the HIGH State and 0.6mA in the LOW state.
LOAD VALUE
HIGH/LOW
70 µA/0.6 mA
70 µA/0.6 mA
20 µA/0.6 mA
20 µA/0.6 mA
20 µA/1.2 mA
20 µA/1.2 mA
20 µA/0.6 mA
20 µA/0.6 mA
3.0 mA/24 mA
15 mA/64 mA
2004 Jul 22
2
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