SCBS075A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
•
•
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SN54BCT29825 . . . JT OR W PACKAGE
SN74BCT29825 . . . 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; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
3-State Buffer-Type Outputs Drive Bus
Lines Directly
Package Options Include Plastic
Small-Outline Packages (DW), Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)
OE1
OE2
1D
2D
3D
4D
5D
6D
7D
8D
CLR
GND
description
These 8-bit bus-interface flip-flops feature 3-state
outputs designed specifically for driving highly
capacitive or relatively low-impedance loads.
They are particularly suitable for implementing
wider buffer registers, I/O ports, bidirectional bus
drivers with parity, and working registers.
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
OE3
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
CLKEN
CLK
1D
OE2
OE1
NC
VCC
SN54BCT29825 . . . FK PACKAGE
(TOP VIEW)
4
3 2
OE3
1Q
•
1 28 27 26
25
The eight flip-flops are edge-triggered D-type
flip-flops. With the clock-enable (CLKEN) input
low, the device enters data on the low-to-high
transition of the clock. Taking CLKEN high
disables the clock buffer, thus latching the outputs.
Taking the clear (CLR) input low causes the eight
Q outputs to go low independently of the clock.
2D
3D
4D
NC
5D
6D
7D
Buffered output-enable (OE1, OE2, or OE3)
inputs can be used to place the eight outputs in
either a normal logic state (high or low) or a
high-impedance state. In the high-impedance
state, the outputs neither load nor drive the bus
lines significantly. The high-impedance state and
increased drive provide the capability to drive bus
lines without need for interface or pullup
components.
NC − No internal connection
5
6
24
7
23
8
22
9
21
10
8D
CLR
GND
NC
CLK
CLKEN
8Q
20
11
19
12 13 14 15 16 17 18
2Q
3Q
4Q
NC
5Q
6Q
7Q
The output-enable inputs do not affect the internal
operation of the flip-flops. Old data can be retained
or new data can be entered while the outputs are
in the high-impedance state.
The SN54BCT29825 is characterized for operation over the full military temperature range of
−55°C to 125°C. The SN74BCT29825 is
characterized for operation from 0°C to 70°C.
Copyright 1993, Texas Instruments Incorporated
!"#$%! & '("")% $& ! *(+,'$%! -$%).
"!-('%& '!!"# %! &*)''$%!& *)" %/) %)"#& ! )0$& &%"(#)%&
&%$-$"- 1$""$%2. "!-('%! *"!')&&3 -!)& !% )')&&$",2 ',(-)
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• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
2−1
SCBS075A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
FUNCTION TABLE
INPUTS
OE†
CLR
CLKEN
CLK
D
OUTPUT
Q
L
L
X
X
X
L
L
H
L
↑
H
H
L
H
L
↑
L
L
L
H
H
H or L
X
Q0
H
X
X
X
X
Z
† OE = H if any of the output-enable inputs is high.
OE = L if all of the output-enable inputs are low.
logic symbol‡
1
OE1
OE2
OE3
CLR
CLKEN
CLK
1D
2D
3D
4D
5D
6D
7D
8D
&
2
EN
23
11
14
13
3
R
G1
1C2
22
2D
4
21
5
20
6
19
7
18
8
17
9
16
10
15
‡ This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the DW, JT, NT, and W packages.
2−2
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
SCBS075A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
logic diagram (positive logic)
1
OE1
OE2
OE3
CLR
CLKEN
CLK
1D
2
23
11
14
22
R
13
1Q
C1
3
1D
To Seven Other Channels
Pin numbers shown are for the DW, JT, NT, and W packages.
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, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . . −0.5 V to 5.5 V
Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state, IO: SN54BCT29825 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
SN74BCT29825 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
Operating free-air temperature range: SN54BCT29825 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74BCT29825 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
recommended operating conditions
SN54BCT29825
SN74BCT29825
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
0.8
V
Input clamp current
−18
−18
mA
IOH
IOL
High-level output current
−15
−24
mA
48
mA
TA
Operating free-air temperature
70
°C
High-level input voltage
2
Low-level output current
2
24
−55
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
125
0
V
V
2−3
SCBS075A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
SN54BCT29825
TYP†
MAX
TEST CONDITIONS
VCC = 4.5 V,
MIN
II = −18 mA
IOH = − 15 mA
VCC = 4.5 V
−1.2
2
3.2
IOH = − 24 mA
IOH = − 3 mA
VCC = 4.75 V,
SN74BCT29825
TYP†
MAX
MIN
−1.2
2.4
3.3
2
3.1
UNIT
V
V
2.7
VOL
VCC = 4.5 V
IOL = 24 mA
IOL = 48 mA
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
−10
−75
IIL
IOS‡
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.5 V
VO = 0
−75
−250
IOZH
IOZL
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2.7 V
VO = 0.5 V
−20
µA
ICCL
ICCH
VCC = 5.5 V,
VCC = 5.5 V,
Outputs open
26
40
26
40
mA
Outputs open
10
16
10
16
mA
ICCZ
Ci
VCC = 5.5 V,
VCC = 5 V,
Outputs open
6
10
6
10
mA
VI = 2.5 V or 0.5 V
VO = 2.5 V or 0.5 V
5
0.38
0.55
0.42
0.1
0.55
V
0.1
mA
−10
−75
µA
−0.2
mA
−75
−250
mA
20
µA
−0.2
20
−20
Co
VCC = 5 V,
7
† All typical values are at VCC = 5 V, TA = 25°C.
‡ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
5
pF
7
pF
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
Setup time before CLK↑
MIN
MAX
MIN
MAX
0
125
0
125
0
125
4
4
4
4
4
Data high
6
6
6
3.5
3.5
3.5
1
1
1
CLR
Data low
CLKEN high or low
2−4
MAX
4
Data high
Hold time after CLK↑
MIN
CLK high or low
CLKEN high or low
th
SN74BCT29825
CLR low
Data low
tsu
SN54BCT29825
•
8
8
8
1.5
1.5
1.5
0
0
0
0.5
0.5
0.5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
UNIT
MHz
ns
ns
ns
SCBS075A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Note 2)
PARAMETER
fmax
tPLH
tPHL
tPHL
FROM
(INPUT)
VCC = 5 V,
TA = 25°C
TO
(OUTPUT)
MIN
SN54BCT29825
TYP
MAX
2.2
5.4
7.8
2.2
9.9
2.2
9
3.1
5.9
7.7
3.1
9.1
3.1
8.4
125
CLK
Q
CLR
Q
tPZH
tPZL
OE
Q
tPHZ
tPLZ
OE
Q
MIN
MAX
SN74BCT29825
125
MIN
UNIT
MAX
125
MHz
3
6.4
8.3
3
9.6
3
9.5
2.1
6.2
8.4
2.1
10.8
2.1
10.3
5.1
9.1
11.4
5.1
13.6
5.1
13.2
2.4
5.9
7.8
2.4
9.8
2.4
9
1.8
5.2
7.2
1.8
9.2
1.8
8.2
ns
ns
ns
ns
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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2−5
SCBS075A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
2−6
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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