SCBS063A − FEBRUARY 1991 − 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
Noninverting Outputs
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
•
•
•
•
•
•
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 SN74BCT2952 consists of 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 accesses the data on either port.
The SN74BCT2952 is characterized for operation from 0°C to 70°C.
logic symbol§
FUNCTION TABLE†
INPUTS
CLKENAB
CLKAB
OEAB
A
OUTPUT
B
B0‡
B0‡
15
OEBA
CLKENBA
H
X
L
X
X
H or L
L
X
L
↑
L
L
L
OEAB
L
↑
L
H
H
CLKENAB
X
X
H
X
Z
CLKBA
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
!"# $ %&'# "$ (&)*%"# +"#',
+&%#$ %! # $('%%"#$ (' #-' #'!$ '."$ $#&!'#$
$#"+"+ /""#0, +&%# (%'$$1 +'$ # '%'$$"*0 %*&+'
#'$#1 "** (""!'#'$,
• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
2−1
SCBS063A − FEBRUARY 1991 − REVISED NOVEMBER 1993
logic diagram (positive logic)
CLKENAB
CLKAB
11
10
9
OEAB
CLKENBA
CLKBA
OEBA
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
•
SCBS063A − FEBRUARY 1991 − 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
VOH
B port
II = −ā 18 mA
IOH = − 1 mA
VCC = 4.5 V
IOH = − 3 mA
IOH = − 3 mA
VCC = 4.5 V
IOH = − 15 mA
IOH = − 3 mA
VCC = 4.75 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
3.1
0.5
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
0.42
Control inputs
A or B ports
V
0.35
Control inputs
A or B ports
UNIT
−1.2
2.7
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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•
2−3
SCBS063A − FEBRUARY 1991 − 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
MIN
fclock
tw
Clock frequency
MIN
125
Pulse duration, CLK high or low
4
4
2.5
2.5
2
2
A or B
1.5
1.5
CLKENAB or CLKENBA
2.5
2.5
A or B
tsu
Setup time before CLK↑
th
Hold time after CLK↑
CLKENAB or CLKENBA
MAX
UNIT
125
MHz
MAX
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
TYP
MIN
CLKBA or CLKAB
A or B
OEBA or OEAB
A or B
•
125
UNIT
MHz
3.5
5.7
7.5
3.5
9
5
7
9.5
5
10.5
2.9
5.2
6.9
2.9
8.2
5.2
7.6
11.4
5.2
12.9
3.5
5.3
7.1
3.5
8.4
2.7
4.3
6
2.7
7
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•
MAX
MAX
125
A or B
OEBA or OEAB
tPLZ
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
2−4
VCC = 5 V,
TA = 25°C
ns
ns
ns
PACKAGE OPTION ADDENDUM
www.ti.com
18-Sep-2008
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
Lead/Ball Finish
MSL Peak Temp (3)
SN74BCT2952DW
OBSOLETE
SOIC
DW
24
TBD
Call TI
Call TI
SN74BCT2952DWR
OBSOLETE
SOIC
DW
24
TBD
Call TI
Call TI
SN74BCT2952NT
OBSOLETE
PDIP
NT
24
TBD
Call TI
Call TI
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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