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74VHCT240A 데이터시트 PDF




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부품번호 74VHCT240A 기능
기능 Octal Buffer/Line Driver with 3-STATE Outputs
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74VHCT240A 데이터시트, 핀배열, 회로
March 1997
Revised March 1999
74VHCT240A
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The VHCT240A is an advanced high speed CMOS octal
bus transceiver fabricated with silicon gate CMOS technol-
ogy. It achieves high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low
power dissipation. The VHCT240A is an inverting 3-STATE
buffer having two active-LOW output enables. This device
is designed to be used as 3-STATE memory address driv-
ers, clock drivers, and bus oriented transmitter/receivers.
Protection circuits ensure that 0V to 7V can be applied to
the input and output (Note 1) pins without regard to the
supply voltage. These circuits prevent device destruction
due to mismatched supply and input/output voltages. This
device can be used to interface 5V to 3V systems and two
supply systems such as battery back up.
Note 1: Outputs in OFF-State
Features
s High Speed: tPD = 5.6 ns (typ) at VCC = 5V
s Power down protection is provided on inputs and
outputs
s Low power dissipation: ICC = 4 µA (max) @ TA = 25°C
s Pin and function compatible with 74HCT240
Ordering Code:
Order Number Package Number
Package Description
74VHCT240AM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74VHCT240ASJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHCT240AMTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHCT240AN
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
OE1, OE2
I0–I7
O0–O7
Description
3-STATE Output Enable
Inputs
Outputs 3-STATE Outputs
© 1999 Fairchild Semiconductor Corporation DS500002.prf
www.fairchildsemi.com




74VHCT240A pdf, 반도체, 판매, 대치품
AC Electrical Characteristics
Symbol
Parameter
VCC
TA = 25°C
TA = −40°C to +85°C
Units
(V) Min Typ Max Min Max
Conditions
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
tOSLH
tOSHL
CIN
Propagation Delay
Time
3-STATE Output
Enable Time
3-STATE Output
Disable Time
Output to
Output Skew
Input
Capacitance
5.0 ± 0.5
5.0 ± 0.5
5.0 ± 0.5
5.0 ± 0.5
5.6 7.8 1.0 9.0
ns
6.1 8.8 1.0 10.0
CL = 15 pF
CL = 50 pF
6.5
10.4
1.0
12.5
ns RL = 1 kCL = 15 pF
7.3 11.4 1.0 13.5
CL = 50 pF
7.0
11.4
1.0
13.0
ns RL = 1 kCL = 50 pF
(Note 8)
1.0 1.0 ns
4 10
10 pF VCC = Open
COUT
Output
Capacitance
9
pF VCC = 5.0V
CPD Power Dissipation
Capacitance
19
(Note 9)
pF
Note 8: Parameter guaranteed by design. tOSLH = |tPLH max tPLH min|; tOSHL = |tPHL max tPHL min|
Note 9: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: ICC (opr.) = CPD * VCC * fIN + ICC/8 (per F/F). The total CPD when n pcs. of the Octal D Flip-Flop operates
can be calculated by the equation: CPD (total) = 20 + 12n.
www.fairchildsemi.com
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74VHCT240A 전자부품, 판매, 대치품
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N20A
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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