PC912X 查看數據表（PDF） - Sharp Electronics
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PC912X Datasheet PDF : 5 Pages
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s Recommended Operating Conditions
Parameter
Low level input current
High level input current
High level enable voltage
Low level enable voltage
Supply voltage
Fan out ( TTL load )
Operating temperature
Symbol
MIN.
MAX.
Unit
I FL
0
250
µA
I FH
7
15
mA
V EH
2.0
V CC
V
V EL
0
0.8
V
V CC
4.5
5.5
V
N
-
8
-
Topr
0
70
˚C
1. When the enable input is not used, please connect to Vcc.
2. It is necessary to connect a by-pass ceramic capacitor
( 0.01 to 0.1 µ F ) between Vcc and GND at the position within
1cm from pin.
s Block Diagram
PC912X
Anode 2
Cathode 3
8 V CC
7 VE
(Enable )
6 VO
5 GND
1.6kΩ
(TYP.)
Buffer
circuit
(*Positive logic )
1kΩ
(TYP.)
VCC
130Ω
(TYP.)
VE
VO
* Positive logic:
V E Buffer output
L
L
H
H
GND
s Truth Table
Input
H
L
H
L
Enable
H
H
L
L
Output
L
H
Z
Z
L : Logic ( 0)
H : Logic ( 1)
Z : High impedance
Fig. 1 Test Circuit for t PHL, t PLH, t r and t f
IF
47Ω
5V
0.1 µ F
VO
CL
IF
tPHL
VO
tf
* C L includes the probe and wiring capacitance.
7.5mA
3.75mA
tPLH
0mA
90% 5V
1.5V
10%
VOL
tr
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