SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• 3-State True Outputs
• Back-to-Back Registers for Storage
• Package Options Include Plastic
Small-Outline and Shrink Small-Outline
Packages and Standard Plastic 300-mil
DIPs
description
The SN74F543 octal transceiver contains two
sets of D-type latches for temporary storage of
data flowing in either direction. Separate
latch-enable (LEAB
or LEBA) and output enable
(OEAB
or OEBA) inputs are provided for each
register to permit independent control in either
direction of data flow. The A outputs are
characterized to sink 24 mA while the B outputs
are characterized to sink 64 mA.
The A-to-B enable (CEAB
) input must be low in order to enter data from A or to output data from B. Having CEAB
low and LEAB low makes the A-to-B latches transparent; a subsequent low-to-high transition of LEAB puts the
A latches in the storage mode. With CEAB
and OEAB both low, the 3-state B outputs are active and reflect the
data present at the output of the A latches. Data flow from B to A is similar, but requires using the CEBA
, LEBA,
and OEBA
inputs.
The SN74F543 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.
The SN74F543 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
†
INPUTS
OUTPUT
CEAB LEAB OEAB A
B
H X X X Z
X XHX Z
LHLXB
0
‡
LLLL L
LLLHH
†
A-to-B data flow is shown; B-to-A flow control is the
same except that it uses CEBA
, LEBA, and OEBA.
‡
Output level before the indicated steady-state input
conditions were established.
DB, DW, OR NT PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
LEBA
OEBA
A1
A2
A3
A4
A5
A6
A7
A8
CEAB
GND
V
CC
CEBA
B1
B2
B3
B4
B5
B6
B7
B8
LEAB
OEAB
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
4
2C6
14
3
A1
4
A2
B1
22
5D
5
A3
6
A4
7
A5
8
A6
9
A7
10
A8
B2
21
B3
20
B5
18
B4
19
B6
17
B8
15
B7
16
LEAB
3
G2
11
CEAB
2EN4
13
OEAB
1C5
1
LEBA
G1
23
CEBA
1EN3
2
OEBA
6D
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OEBA
CEBA
LEBA
OEAB
CEAB
LEAB
A1
B1
C1
1D
C1
1D
2
23
1
13
11
14
3
22
To Seven Other Channels
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(excluding I/O ports) (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range, I
IK
–30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state –0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: A1–A8 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B1–B8 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input-voltage ratings may be exceeded provided the input-current ratings are observed.
recommended operating conditions
MIN NOM MAX UNIT
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
I
IK
Input clamp current –18 mA
p
A1–A8 –3
IOHHigh-level output current
B1–B8 –15
mA
p
A1–A8 24
IOLLow-level output current
B1–B8 64
mA
T
A
Operating free-air temperature 0 70 °C
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
VCC = 4.5 V, II = – 18 mA –1.2 V
IOH = – 1 mA 2.5 3.4
A1–A8
IOH = – 3 mA 2.4 3.3
V
OH
V
CC
= 4.5
V
IOH = – 3 mA 2.4 3.3
V
B1–B8
IOH = – 15 mA 2 3.1
Any output VCC = 4.75 V , IOH = – 1 mA to –3 mA 2.7
A1–A8
IOL = 24 mA 0.3 0.5
V
OL
B1–B8
V
CC
= 4.5
V
IOL = 64 mA 0.42 0.55
V
OE, LE, and CE
VI = 7 V 0.1
I
I
A and B ports
V
CC
= 5.5
V
VI = 5.5 V 1
mA
OE, LE, and CE
20
I
IH
‡
A and B ports
V
CC
= 5.5 V,
V
I
= 2.7
V
70
µ
A
OE, LE, and CE
–1.2
I
IL
‡
A and B ports
V
CC
= 5.5 V,
V
I
= 0.5
V
–0.65
mA
A1–A8
–60 –150
I
OS
§
B1–B8
V
CC
=
5.5 V
,
V
O
=
0
–100 –225
mA
I
CCH
VCC = 5.5 V 67 100 mA
I
CCL
VCC = 5.5 V 83 125 mA
I
CCZ
VCC = 5.5 V 83 125 mA
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
For I/O ports, the parameters IIH and IIL include the off-state output current.
§
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
timing requirements
VCC = 5 V,
TA = 25°C
VCC = 4.5 V to 5.5 V,
TA = MIN to MAX
¶
UNIT
MIN MAX MIN MAX
t
w
Pulse duration 5 5 ns
t
su
Setup time, data before latch enable High or low 3 3.5 ns
t
h
Hold time, data after latch enable High or low 3 3.5 ns
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
2–5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX
†
UNIT
MIN TYP MAX MIN MAX
t
PLH
2.2 5.1 7.5 2.2 8.5
t
PHL
A or B
B or A
2.2 4.6 6.5 2.2 7.5
ns
t
PLH
3.7 8.1 11 4.1 12.5
t
PHL
LEBA
A
3.7 8.1 11 4.1 12.5
ns
t
PLH
3.7 8.1 11 4.1 12.5
t
PHL
LEAB
B
3.7 8.1 11 4.1 12.5
ns
t
PZH
2.2 6.6 9 2.2 10
t
PZL
OE
or
CE
A or B
3.2 7.1 10.5 3.2 12
ns
t
PHZ
1.7 5.6 8 1.7 9
t
PLZ
OE or CE
A or B
1.7 5.1 7.5 1.7 8.5
ns
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
2–6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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Copyright 1998, Texas Instruments Incorporated
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