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CD54HC4538 データシート(PDF) 1 Page - Texas Instruments

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部品番号 CD54HC4538
部品情報  High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

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Data sheet acquired from Harris Semiconductor
SCHS123
Features
• Retriggerable/Resettable Capability
• Trigger and Reset Propagation Delays Independent of
RX, CX
• Triggering from the Leading or Trailing Edge
• Q and Q Buffered Outputs Available
• Separate Resets
• Wide Range of Output-Pulse Widths
• Schmitt Trigger Input on A and B Inputs
• Retrigger Time is Independent of CX
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
Pinout
CD54HC4538, CD74HC4538, CD74HCT4538
(PDIP, SOIC, CERDIP)
TOP VIEW
Description
The
Harris
CD54HC4538,
CD74HC4538
and
CD74HCT4538 are dual retriggerable/resettable monostable
precision multivibrators for fixed voltage timing applications.
An external resistor (RX) and an external capacitor (CX)
control the timing and the accuracy for the circuit.
Adjustment of RX and CX provides a wide range of output
pulse widths from the Q and Q terminals. The propagation
delay
from
trigger
input-to-output
transition
and
the
propagation delay from reset input-to-output transition are
independent of RX and CX.
Leading-edge triggering (A) and trailing edge triggering (B)
inputs are provided for triggering from either edge of the
input pulse. An unused “A” input should be tied to GND and
an unused B should be tied to VCC. On power up the IC is
reset. Unused resets and sections must be terminated. In
normal operation the circuit retriggers on the application of
each new trigger pulse. To operate in the non-triggerable
mode Q is connected to B when leading edge triggering (A)
is used or Q is connected to A when trailing edge triggering
(B) is used. The period (
τ) can be calculated from τ = (0.7)
RX, CX; RMIN is 5kΩ. CMIN is 0pF.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
1CX
1RXCX
1R
1A
1B
1Q
GND
1Q
VCC
2RXCX
2R
2A
2B
2Q
2Q
2CX
Ordering Information
PART NUMBER
TEMP. RANGE
(oC)
PACKAGE
PKG.
NO.
CD54HC4538F
-55 to 125
16 Ld CERDIP
F16.3
CD74HC4538E
-55 to 125
16 Ld PDIP
E16.3
CD74HCT4538E
-55 to 125
16 Ld PDIP
E16.3
CD74HC4538M
-55 to 125
16 Ld SOIC
M16.15
CD74HCT4538M
-55 to 125
16 Ld SOIC
M16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all
electrical specifications. Please contact your local sales office or
Harris customer service for ordering information.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1998
File Number
1671.2
CD54HC4538, CD74HC4538,
CD74HCT4538
High Speed CMOS Logic Dual Retriggerable
Precision Monostable Multivibrator
[ /Title
(CD54
HC453
8,
CD74
HC453
8,
CD74
HCT45
38)
/Sub-
ject
(High
Speed
CMOS
Logic
June 1998


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