HD74LV2GT123A
Retriggerable Monostable Multivibrator
ADE-205-699 (Z)
Preliminary
Rev.0
Jul. 2002
Description
The HD74LV2GT123A features output pulse duration control by three methods. In the first method, the
A
input is low and the B input goes high. In the second method, the B input is high and the
A
input goes low.
In the third method, the
A
input is low, the B input is high, and the clear (CLR) input goes high. The basic
pulse duration is programmed by selecting external resistance and capacitance values. The external timing
capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor connected
between Rext/Cext and V
CC
. To obtain variable pulse durations, connect an external variable resistance
between Rext/Cext and V
CC
. Once triggered, the basic pulse duration can be extended by retriggering the
gated low level active (A) or high level active (B) input. Pulse duration can be reduced by taking
CLR
low. The output pulse equation is simply : t
WQ
= Cext
•
Rext.
Low voltage and high speed operation is suitable for the battery powered products (e.g., notebook
computers), and the low power consumption extends the battery life.
Features
•
The basic gate function is lined up as hitachi uni logic series.
•
Supplied on emboss taping for high speed automatic mounting.
•
Control input is TTL compatible input level.
Supply voltage range : 4.5 to 5.5 V
Operating temperature range : –40 to +85°C
•
All inputs V
IH
(Max.) = 5.5 V (@V
CC
= 0 V to 5.5 V)
All outputs V
O
(Max.) = 5.5 V (@V
CC
= 0 V)
•
Output current ±12 mA (@V
CC
= 4.5 V to 5.5 V)
•
All the logical inputs have hysteresis voltage for the slow transition.
•
Package type
Package type
SSOP-8 pin
Package code
TTP-8DBV
Package suffix
US
Taping code
E (3,000 pcs / Reel)
HD74LV2GT123A
Outline and Article Indication
• HD74LV2GT123A
Index band
Lot No.
Y M W
T 2 3
SSOP–8
Type No.
Y : Year code
(the last digit of year)
M : Month code
W : Week code
Function Table
Inputs
CLR
L
H
H
H
H
↑
H : High level
L : Low level
X : Immaterial
↑
: Low to high transition
↓
: High to low transition
: High level pulse
A
X
H
X
L
↓
L
B
X
X
L
↑
H
H
L
L
L
Output Q
Rev.0, Jul. 2002, page 2 of 12
HD74LV2GT123A
Pin Arrangement
A
1
8
V
CC
B
2
7
Rext / Cext
CLR
3
6
Cext
GND
4
5
Q
(Top view)
Absolute Maximum Ratings
Item
Supply voltage range
Input voltage range
*1
*1, 2
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or I
GND
P
T
Tstg
Ratings
–0.5 to 7.0
–0.5 to 7.0
–0.5 to V
CC
+ 0.5
–0.5 to 7.0
–20
±50
±25
±50
200
–65 to 150
Unit
V
V
V
mA
mA
mA
mA
mW
°C
Test Conditions
Output voltage range
Input clamp current
Output clamp current
Output : H or L
V
CC
: OFF
V
I
< 0
V
O
< 0 or V
O
> V
CC
V
O
= 0 to V
CC
Continuous output current
Continuous current through
V
CC
or GND
Maximum power dissipation
*3
at Ta = 25°C (in still air)
Storage temperature
Notes:
The absolute maximum ratings are values which must not individually be exceeded, and
furthermore no two of which may be realized at the same time.
1. The input and output voltage ratings may be exceeded if the input and output clamp-current
ratings are observed.
2. This value is limited to 5.5 V maximum.
3. The maximum package power dissipation was calculated using a junction temperature of 150°C.
Rev.0, Jul. 2002, page 3 of 12
HD74LV2GT123A
Recommended Operating Conditions
Item
Supply voltage range
Input voltage range
Output voltage range
Output current
Symbol
V
CC
V
I
V
O
I
OH
I
OL
Input transition rise or fall rate
∆t
/
∆v
External timing registance
External capacitance
Supply transition rise rate
Rext
Cext
∆t
/
∆V
CC
Min
4.5
0
0
—
—
0
1
—
1
–40
Typ
—
—
—
—
—
—
—
Max
5.5
5.5
V
CC
–12
12
20
—
ns / V
kΩ
F
ms / V
°C
Unit
V
V
V
mA
V
CC
= 4.5 to 5.5 V
V
CC
= 4.5 to 5.5 V
V
CC
= 4.5 to 5.5 V
V
CC
= 4.5 to 5.5 V
Conditions
Unlimited
—
—
—
—
85
Operating free-air temperature T
a
Note: Unused or floating inputs must be held high or low.
Logic Diagram
Rext/
Cext
Cext
A
B
Q
Q
CLR
CLR
Rev.0, Jul. 2002, page 4 of 12
HD74LV2GT123A
Electrical Characteristic
•
Ta = –40 to 85°C
Item
Input voltage
Symbol V
CC
(V) *
V
IH
V
IL
Hysteresis voltage V
H
Output voltage
V
OH
V
OL
Input current
Input current
Rext / Cext
Quiescent
supply current
Active state
supply current
Output leakage
current
I
IN
I
IN
I
CC
∆I
CC
I
OFF
4.5 to 5.5
4.5 to 5.5
5.0
Min to Max
4.5
Min to Max
4.5
0 to 5.5
5.5
5.5
4.5
5.5
0
5.0
Min
2.0
—
—
V
CC
–0.1
3.8
—
—
—
—
—
—
—
—
—
Typ
—
—
0.15
—
—
—
—
—
—
—
—
—
—
3.0
Max
—
0.8
—
—
—
0.1
0.55
±1
±2.5
10
650
975
5
—
µA
pF
µA
µA
µA
µA
V
V
V
T
– V
T
+
–
Unit
V
Test condition
I
OH
= –50
µA
I
OH
= –12 mA
I
OL
= 50
µA
I
OL
= 12 mA
V
IN
= 5.5 V or GND
V
IN
= V
CC
or GND
V
IN
= V
CC
or GND,
I
O
= 0
V
IN
= V
CC
or GND
Rext / Cext = 0.5V
CC
V
IN
or V
O
= 0 to 5.5 V
Input capacitance C
IN
V
IN
= V
CC
or GND
Note: For conditions shown as Min or Max, use the appropriate values under recommended operating
conditions.
Rev.0, Jul. 2002, page 5 of 12
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
