SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993
•
DW OR NT PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
Two 8-Bit, Back-to-Back Registers Store
Data Flowing in Both Directions
A Port Sinks 24 mA and Sources 3 mA
B Port Sinks 64 mA and Sources 15 mA
Inverting Outputs
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
•
•
•
•
•
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B8
B7
B6
B5
B4
B3
B2
B1
OEAB
CLKAB
CLKENAB
GND
description
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
VCC
A8
A7
A6
A5
A4
A3
A2
A1
OEBA
CLKBA
CLKENBA
The SN74BCT2953 octal bus transceiver contains two 8-bit back-to-back registers that store data flowing in
both directions between two bidirectional buses. Data on the A or B bus is stored in the registers on the
low-to-high transition of the clock (CLKAB or CLKBA) input provided that the clock-enable (CLKENAB or
CLKENBA) input is low. Taking the output-enable (OEAB or OEBA) input low allows access of the data on the
output port (B port or A port).
The SN74BCT2953 is characterized for operation from 0°C to 70°C.
logic symbol§
FUNCTION TABLE†
INPUTS
CLKENAB
CLKAB
OEAB
A
OUTPUT
B
OEBA
H
X
L
X
X
H or L
L
X
B0‡
B0‡
L
↑
L
L
H
OEAB
L
↑
L
H
L
CLKENAB
X
X
H
X
Z
CLKENBA
CLKBA
15
13
14
9
CLKAB
† A-to-B data flow is shown; B-to-A data flow is similar but
uses CLKENBA, CLKBA, and OEBA.
‡ Level of B before the indicated steady-state input
conditions were established.
A1
A2
A3
A4
A5
A6
A7
A8
11
10
16
17
EN3
G1
1 C5
EN4
G2
2 C6
3
1
5D
6D
1
4
8
7
18
6
19
5
20
4
21
3
22
2
23
1
B1
B2
B3
B4
B5
B6
B7
B8
§ This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Copyright 1993, Texas Instruments Incorporated
!"# $ %&'# "$ (&)*%"# +"#',
+&%#$ %! # $('%%"#$ (' #-' #'!$ '."$ $#&!'#$
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#'$#1 "** (""!'#'$,
• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
2−1
SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993
logic diagram (positive logic)
CLKENAB
CLKAB
OEAB
CLKENBA
CLKBA
OEBA
11
10
9
13
14
15
C1
A1
16
8
1D
B1
C1
1D
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
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 VCC
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 negative-voltage rating may be exceeded if the input clamp-current rating is observed.
2−2
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993
recommended operating conditions (see Note 2)
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
High-level input voltage
MIN
NOM
MAX
4.5
5
5.5
2
High-level output current
IOL
Low-level output current
0.8
V
−18
mA
A ports
−3
B ports
−15
A ports
24
B ports
64
TA
Operating free-air temperature
NOTE 2: Unused or floating pins (input or I/O) must be held high or low.
V
V
Input clamp current
IOH
UNIT
0
70
mA
mA
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
TEST CONDITIONS
VCC = 4.5 V,
A port
II = −ā 18 mA
IOH = − 1 mA
VCC = 4.5 V
IOH = − 3 mA
IOH = − 3 mA
VOH
B port
IOH = − 12 mA
IOH = − 15 mA
VCC = 4.5 V
A port
VOL
II‡
IIH‡
IIL‡
IOS§
B port
VCC = 4.5 V
IOL = 24 mA
IOL = 64 mA
VCC = 5.5 V,
VI = 5.5 V
VCC = 5.5 V,
VI = 2.7 V
VCC = 5.5 V,
VI = 0.5 V
VCC = 5.5 V,
VO = 0
MIN
TYP†
2.5
3.4
2.4
3.3
2.4
3.3
2
0.5
0.42
0.55
0.1
70
20
−70
ICCH¶
ICCL¶
VCC = 5.5 V
VCC = 5.5 V
ICCZ
Ci
VCC = 5.5 V
VCC = 5 V,
Control inputs
V
1
Any A
Any B
V
0.35
Control inputs
A or B ports
V
3.1
Control inputs
A or B ports
UNIT
−1.2
3.2
Control inputs
A or B ports
MAX
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
−20
−60
−150
−100
−250
mA
µA
A
µA
A
mA
2
5
mA
38
55
mA
2
5
mA
6
pF
Cio
A or B ports
VCC = 5 V,
12.5
† All typical values are at VCC = 5 V, TA = 25°C.
‡ For I/O ports, the parameters IIH and IIL include the off-shoot 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.
¶ ICCH and ICCL are measured in the A-to-B mode.
pF
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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2−3
SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
VCC = 5 V,
TA = 25°C
fclock
Clock frequency
tw
Pulse duration
tsu
Setup time before CLK↑
th
Hold time after CLK↑
MIN
MAX
0
110
MIN
MAX
UNIT
0
110
MHz
CLK high
4.5
4.5
CLK low
4.5
4.5
A or B
2.5
2.5
2
2
1.5
1.5
2
2
CLKENAB or CLKENBA
A or B
CLKENAB or CLKENBA
ns
ns
ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Note 3)
PARAMETER
fmax
tPLH
tPHL
tPZH
tPZL
tPHZ
FROM
(INPUT)
TO
(OUTPUT)
MIN
MIN
CLKBA or CLKAB
A or B
OEBA or OEAB
A or B
OEBA or OEAB
A or B
MAX
2.5
6.3
8
2.5
9.5
4.3
7.8
9.4
4.3
10.2
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110
UNIT
MHz
2.1
5.8
7.3
2.1
8.8
5.2
10.3
12.1
5.2
14
2.3
5.5
7.6
2.3
9.1
1.8
5.5
7.1
1.8
7.6
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
MAX
TYP
110
tPLZ
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
2−4
VCC = 5 V,
TA = 25°C
ns
ns
ns
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