UM3750_1 Datasheet, PDF (3/5 Pages) UMC Corporation – Programmable Encoder/Decoder

Absolute Maximum Ratings*
Power Supply Voltage
-0 3v to 11v
Operating Temperature
- 2 0 Deg to 70 D e g C
Storage Temperature (Tstg)
--55 Deg to 150 Deg C
Applied Voltage on any Pin
vss PO.3 < v,, < v,, + o 3
UM3750
*Comments
S t r e s s e s above those ilsted Iunder “Absolute Maximum
R a t i n g s ” m a y c a u s e p e r m a n e n t d a m a g e t o t h e dewce.
These are stress ratings only. Functional operation of
this device at these or any other conditions above those
indtcated in the operational sections of this specification
IS not implled a n d e x p o s u r e t o a b s o l u t e maximuln r a t i n g
c o n d i t i o n s f o r e x t e n d e d pertods m a y a f f e c t d e v i c e rell-
ability.
D.C. Electrical Characteristics (T, = 25°C. vDD = 9V ilnless otherwise specified)
Input Level
Input Resistor
_
to Vcc
Oscillator Frequency
F
Pin Designation
Pin No.
l-12
Designation
Al - Al2
13
R.C. INPUT
14
Vss
15
MODE SELECT
16
RECEIVER
INPUT
17
TXIRX
OUTPUT
18
Vcc
200K
_
1.2M
_
100
_
R
KHz
kl5% exclusive
of external
components
Description
These data select lines are used to set the addresses of the encoder/decoder
pair They have on-chip pull-up resistors.
R . C . i n p u t pin for sinqle pin o s c i l l a t o r . A reslstor IS h o o k e d f r o m this
pin to Vcc a n d a capacttor f r o m this pin t o G N D T h e f r e q u e n c y =
2lRC.
The ground pin of the UM3750.
This pin changes the IC f r o m R e c e i v e m o d e TO T r a n s m i t m o d e , B y
g r o u n d i n g this pin the IC IS p u t I n t o t h e R e c e i v e m o d e . B y c o n n e c t i n g
to VC- the IC IS put into the Transmit m o d e
T h e r e c e i v e r i n p u t r e c e i v e s t h e d i g i t a l P C M w a v e f o r m from the detect
CIrClllt.
In the transmit mode, this output pin p r o d u c e s t h e P C M w a v e f o r m f o r
transmlttlnq. I n t h e r e c e i v e m o d e , this output pin p r o v i d e s t h e come
partson result and detects low If comparison is ok.
The positive power supply pin of the UM3750.
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