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74VHC943NX Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza 74VHC943NX
Descripción Electrónicos  300 Baud Modem (5V Supply)
Download  12 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

74VHC943NX Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Description of Pin Functions
Pin
Name
Function
No
1
DSI
Driver Summing Input This input may be
used to transmit externally generated tones
such as dual tone multifrequency (DTMF) di-
aling signals
2
ALB
Analog Loop Back A logic high on this pin
causes the modulator output to be connect-
ed to the demodulator input so that data is
looped back through the entire chip This is
used as a chip self test If ALB and SQT are
simultaneously held high the chip powers
down
3CD
Carrier Detect This pin goes to a logic low
when carrier is sensed by the carrier detect
circuit
4
CDT
Carrier Detect Timing A capacitor on this
pin sets the time interval that the carrier
must be present before the CD goes low
5
RXD
Received Data This is the data output pin
6VCC
Positive Supply Pin A a5V supply is recom-
mended
7
CDA
Carrier Detect Adjust This is used for ad-
justment of the carrier detect threshold Car-
rier detect hysteresis is set at 3 dB
8
XTALD
Crystal Drive XTALD and XTALS connect
to a 35795 MHz crystal to generate a crys-
tal locked clock for the chip If an external
circuit requires this clock XTALD should be
sensed If a suitable clock is already avail-
able in the system XTALD can be driven
9
XTALS
Crystal Sense Refer to pin 8 for details
Pin
Name
Function
No
10
FTLC
Filter TestLimiter Capacitor This is con-
nected to a high impedance output of the
receiver filter It may thus be used to evalu-
ate filter performance This pin may also be
driven to evaluate the demodulator RXA1
and RXA2 must be grounded during this
test
For normal modem operation FTLC is AC
grounded via a 01 mF bypass capacitor
11
TXD
Transmitted Data This is the data input
12
GND
Ground This defines the chip 0V
13
OA
OriginateAnswer mode select When logic
high this pin selects the originate mode of
operation
14
SQT
Squelch Transmitter This disables the mod-
ulator when held high The EXI input re-
mains active If SQT and ALB are simulta-
neously held high the chip powers down
15
RXA2
Receive Analog
2 RXA2 and RXA1 are
analog inputs When connected as recom-
mended they produce a 600X hybrid
16
RXA1
Receive Analog
1 See RXA2 for details
17
TXA
Transmit Analog This is the output of the
line driver
18
EXI
External Input This is a high impedance in-
put to the line driver This input may be used
to transmit externally generated tones
When not used for this purpose it should be
grounded to GNDA
19
GNDA
Analog Ground Analog signals within the
chip are referred to this pin
20
TLA
Transmit Level Adjust A resistor from this
pin to VCC sets the transmit level
3


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