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CD74FCT541
BiCMOS OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS741 – JULY 2000
D
D
D
D
D
D
D
D
D
BiCMOS Technology With Low Quiescent
Power
Buffered Inputs
Noninverted Outputs
Input/Output Isolation From V
CC
Controlled Output Edge Rates
64-mA Output Sink Current
Output Voltage Swing Limited to 3.7 V
SCR Latch-Up-Resistant BiCMOS Process
and Circuit Design
Package Options Include Plastic
Small-Outline (M) and Shrink Small-Outline
(SM) Packages and Standard Plastic (E) DIP
E, M, OR SM PACKAGE
(TOP VIEW)
OE1
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
OE2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
description
The CD74FCT541 is an octal buffer/driver with 3-state outputs that is ideal for driving bus lines or buffer memory
address registers and uses a small-geometry BiCMOS technology. The output stage is a combination of bipolar
and CMOS transistors that limits the output high level to two diode drops below V
CC
. This resultant lowering
of output swing (0 V to 3.7 V) reduces power-bus ringing [a source of electromagnetic interference (EMI)] and
minimizes V
CC
bounce and ground bounce and their effects during simultaneous output switching. The output
configuration also enhances switching speed and is capable of sinking 64 mA.
The 3-state control gate is a two-input AND gate with active-low inputs, so that if either output-enable (OE1 or
OE2) input is high, all corresponding outputs are in the high-impedance state. The outputs provide noninverted
data when they are not in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The CD74FCT541 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer/driver)
INPUTS
OE1
L
L
H
X
OE2
L
L
X
H
A
L
H
X
X
OUTPUT
Y
L
H
Z
Z
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
©
2000, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
CD74FCT541
BiCMOS OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS741 – JULY 2000
logic symbol
†
OE1
OE2
1
19
&
EN
A1
A2
A3
A4
A5
A6
A7
A8
2
3
4
5
6
7
8
9
1
18
17
16
15
14
13
12
11
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OE1
OE2
1
19
A1
2
18
Y1
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
DC supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6 V
DC input clamp current, I
IK
(V
I
< –0.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20 mA
DC output clamp current, I
OK
(V
O
< –0.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
DC output sink current per output pin, I
OL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 mA
DC output source current per output pin, I
OH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA
Continuous current through V
CC
, I
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 mA
Continuous current through GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528 mA
Package thermal impedance,
θ
JA
(see Note 1): E package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
M package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
SM package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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 package thermal impedance is calculated in accordance with JESD 51.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
CD74FCT541
BiCMOS OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS741 – JULY 2000
recommended operating conditions (see Note 3)
MIN
VCC
VIH
VIL
VI
VO
IOH
IOL
∆t/∆v
Supply voltage
High-level input voltage
Low-level input voltage
Input voltage
Output voltage
High-level output current
Low-level output current
Input transition rise or fall rate
0
0
0
4.75
2
0.8
VCC
VCC
–15
64
10
MAX
5.25
UNIT
V
V
V
V
V
mA
mA
ns/V
TA
Operating free-air temperature
0
70
°C
NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs,
literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
II
IOZ
IOS†
ICC
∆I
CC‡
Ci
Co
II = –18 mA
IOH = –15 mA
IOL = 64 mA
VI = VCC or GND
VO = VCC or GND
VI = VCC or GND,
VI = VCC or GND,
One input at 3.4 V,
Other inputs at VCC or GND
VI = VCC or GND
VO = VCC or GND
VO = 0
IO = 0
TEST CONDITIONS
VCC
4.75 V
4.75 V
4.75 V
5.25 V
5.25 V
5.25 V
5.25 V
5.25 V
–60
8
1.6
10
15
2.4
0.55
±0.1
±0.5
–60
80
1.6
10
15
TA = 25°C
MIN
MAX
–1.2
2.4
0.55
±1
±10
MIN
MAX
–1.2
UNIT
V
V
V
m
A
m
A
mA
m
A
mA
pF
pF
† Not more than one output should be tested at a time, and the duration of the test should not exceed 100 ms.
‡ This is the increase in supply current for each input at one of the specified TTL voltage levels rather than 0 V or VCC.
switching characteristics over recommended operating conditions, V
CC
= 5 V
±
0.25 V (unless
otherwise noted) (see Figure 1)
PARAMETER
tpd
ten
tdis
FROM
(INPUT)
A
OE
OE
TO
(OUTPUT)
Y
Y
Y
TA = 25°C
TYP
6
7.5
7.1
MIN
2
2
2
MAX
8
10
9.5
UNIT
ns
ns
ns
noise characteristics, V
CC
= 5 V, C
L
= 50 pF, T
A
= 25°C
PARAMETER
VOL(P)
VOH(V)
VIH(D)
VIL(D)
Quiet output, maximum dynamic VOL
Quiet output, minimum dynamic VOH
High-level dynamic input voltage
Low-level dynamic input voltage
2
0.8
MIN
TYP
1
0.5
MAX
UNIT
V
V
V
V
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
CD74FCT541
BiCMOS OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS741 – JULY 2000
operating characteristics, T
A
= 25°C
PARAMETER
Cpd
Power dissipation capacitance
TEST CONDITIONS
No load,
f = 1 MHz
TYP
40
UNIT
pF
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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