UM3750
Absolute Maximum Ratings*
P o w e r
Operating
S u p p l y
V o l t a g e
*Comments
-0
3v to 11v
C
Stresses
Ratings”
These
are
may
above those ilsted Iunder
cause
permanent
only.
stress
ratings
“Absolute
to
Maximum
dewce.
of
Temperature
- 2 0 Deg to 70 D e g
damage
the
Functional
operation
Storage Temperature (Tstg)
Applied Voltage on any Pin
--55 Deg to 150 Deg C
this device at these or any other conditions above those
indtcated
in the operational sections of this specification
a n d e x p o s u r e t o a b s o l u t e maximuln
rating
m a y a f f e c t d e v i c e rell-
IS not implled
vss
PO.3 < v,, < v,, + o 3
c o n d i t i o n s f o r e x t e n d e d pertods
ability.
D.C. Electrical Characteristics
(T, = 25°C. vDD = 9V ilnless
otherwise specified)
Input Level
Input Resistor
to Vcc
_
200K
_
1.2M
R
Oscillator
Frequency
F
_
100
_
KHz
kl5% exclusive
of external
components
Pin Designation
Pin No.
l - 1 2
Designation
Al - Al2
Description
These data select lines are used to set the addresses of the encoder/decoder
pair They have on-chip
pull-up resistors.
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
GND
f r o m this
13
R.C. INPUT
R.C.
2lRC.
i n p u t pin for sinqle pin
pin to Vcc a n d a capacttor
The frequency =
14
15
Vss
MODE
SELECT
The ground pin
of the UM3750.
Receive
m o d e TO T r a n s m i t
mode,
By
This pin changes the IC f r o m
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
16
RECEIVER
INPUT
17
TXIRX
OUTPUT
mode
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
transmlttlnq.
produces the PCM waveform for
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.
18
Vcc
The positive power
supply
pin of the UM3750.
2-5
UMC [ UMC CORPORATION ]
