SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
•
•
•
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
DB, DW, OR NT PACKAGE
(TOP VIEW)
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.
LEBA
OEBA
A1
A2
A3
A4
A5
A6
A7
A8
CEAB
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
CEBA
B1
B2
B3
B4
B5
B6
B7
B8
LEAB
OEAB
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
CEAB
H
X
L
L
L
LEAB
X
X
H
L
L
OEAB
X
H
L
L
L
A
X
X
X
L
H
OUTPUT
B
Z
Z
B0‡
L
H
† 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.
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.
Copyright
©
1993, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2–1
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
logic symbol
†
2
OEBA
23
CEBA
1
LEBA
13
OEAB
11
CEAB
14
LEAB
A1
3
3
4
5
6
7
8
9
10
6D
1EN3
G1
1C5
2EN4
G2
2C6
5D
4
22
B1
A2
A3
A4
A5
A6
A7
A8
21
20
19
18
17
16
15
B2
B3
B4
B5
B6
B7
B8
† 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
2
23
1
13
11
14
3
C1
1D
22
B1
C1
1D
To Seven Other Channels
2–2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
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
VCC
VIH
VIL
IIK
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level
High level output current
Low-level
Low level output current
Operating free-air temperature
A1 – A8
B1 – B8
A1 – A8
B1 – B8
0
4.5
2
0.8
– 18
–3
– 15
24
64
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2–3
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
A1 – A8
VOH
VCC = 4 5 V
4.5
B1 – B8
Any output
VOL
II
IIH‡
IIL‡
IOS§
ICCH
ICCL
A1 – A8
B1 – B8
OE, LE, and CE
A and B ports
OE, LE, and CE
A and B ports
OE, LE, and CE
A and B ports
A1 – A8
B1 – B8
VCC = 4.75 V,
VCC = 4 5 V
4.5
VCC = 5 5 V
5.5
VCC = 5 5 V
5.5 V,
VCC = 5 5 V
5.5 V,
VCC = 5 5 V
5.5 V,
VCC = 5.5 V
VCC = 5.5 V
VCC = 4.5 V,
TEST CONDITIONS
II = – 18 mA
IOH = – 1 mA
IOH = – 3 mA
IOH = – 3 mA
IOH = – 15 mA
IOH = – 1 mA to – 3 mA
IOL = 24 mA
IOL = 64 mA
VI = 7 V
VI = 5.5 V
VI = 2 7 V
2.7
VI = 0 5 V
0.5
VO = 0
– 60
– 100
67
83
MIN
2.5
2.4
2.4
2
2.7
0.3
0.42
0.5
0.55
0.1
1
20
70
– 1.2
– 0.65
– 150
– 225
100
125
125
V
mA
µA
mA
mA
mA
mA
mA
TYP†
3.4
3.3
3.3
3.1
V
MAX
– 1.2
UNIT
V
ICCZ
VCC = 5.5 V
83
† 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
MIN
tw
tsu
Pulse duration
Setup time, data before latch enable
High or low
5
3
MAX
VCC = 4.5 V to 5.5 V,
TA = MIN to MAX¶
MIN
5
3.5
MAX
ns
ns
ns
UNIT
th
Hold time, data after latch enable
High or low
3
3.5
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
2–4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993
switching characteristics (see Note 2)
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500
Ω,
TA = 25°C
MIN
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
A or B
B or A
A
B
A or B
A or B
2.2
2.2
3.7
3.7
3.7
3.7
2.2
3.2
1.7
1.7
TYP
5.1
4.6
8.1
8.1
8.1
8.1
6.6
7.1
5.6
5.1
MAX
7.5
6.5
11
11
11
11
9
10.5
8
7.5
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
Ω,
TA = MIN to MAX †
MIN
2.2
2.2
4.1
4.1
4.1
4.1
2.2
3.2
1.7
1.7
MAX
8.5
7.5
12.5
12.5
12.5
12.5
10
12
9
8.5
ns
ns
ns
ns
ns
PARAMETER
UNIT
LEBA
LEAB
OE or CE
OE or CE
† 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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2–5
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