LTC1323CS Linear Technology Corporation, LTC1323CS Datasheet

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LTC1323CS

Manufacturer Part Number
LTC1323CS
Description
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURE
A
AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
PPLICATI
Single Chip Provides Complete
LocalTalk
Operates From a Single 5V Supply
ESD Protection to 10kV on Receiver Inputs
and Driver Outputs
Low Power: I
Shutdown Pin Reduces I
Receiver Keep-Alive Function: I
Differential Driver Drives Either Differential
AppleTalk or Single-Ended EIA562 Loads
Drivers Maintain High Impedance in Three-State or
with Power Off
Thermal Shutdown Protection
Drivers are Short-Circuit Protected
LocalTalk Peripherals
Notebook/Palmtop Computers
Battery-Powered Systems
®
/AppleTalk Port
S
A
CC
O
PPLICATI
0.33 F
= 2.4mA Typ
U
S
TXDEN
SHDN
RXDO
RXEN
CPEN
RXO
RXO
TXD
TXI
CC
10
11
12
1
2
3
4
5
6
7
8
9
to 0.5 A Typ
O
CHARGE PUMP
CC
U
LTC1323
= 65 A Typ
DX
DX
RX
RX
RX
24
23
22
21
20
19
18
17
16
15
14
13
TXD
TXD
TXO
RXI
RXI
RXD
RXD
5V
+
+
0.33 F
EMI FILTER
EMI FILTER
EMI FILTER
EMI FILTER
EMI FILTER
EMI FILTER
+
1 F
1 F
+
D
The LTC
to operate on AppleTalk or EIA562-compatible single-
ended networks while operating from a single 5V supply.
There are two versions of the LTC1323 available: a 16-pin
version designed to connect to an AppleTalk network,
and a 24-pin version which also includes the additional
single-ended drivers and receivers necessary to create
an Apple-compatible serial port. An on-board charge
pump generates a – 5V supply which can be used to
power external devices. Additionally, the 24-pin LTC1323
features a micropower keep-alive mode during which
one of the single-ended receivers is kept active to monitor
external wake-up signals. The LTC1323 draws only 2.4mA
quiescent current when active, 65 A in receiver keep-
alive mode, and 0.5 A in shutdown, making it ideal for
use in battery-powered systems.
The differential driver can drive either differential AppleTalk
loads or conventional single-ended loads. The driver
outputs three-state when disabled, during shutdown, in
receiver keep-alive mode, or when the power is off. The
driver outputs will maintain high impedance even with
output common-mode voltages beyond the power supply
rails. Both the driver outputs and receiver inputs are
protected against ESD damage to 10kV.
ESCRIPTIO
EMI FILTER
EMI FILTER
®
1323 is a multi-protocol line transceiver designed
AppleTalk
=
5 TO 10
8
5
U
2
7
4
1
6
3
5 TO 10
100pF
LTC1323 • TA01
®
Transceiver
Single 5V
LTC1323
1

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LTC1323CS Summary of contents

Page 1

... Power Off Thermal Shutdown Protection Drivers are Short-Circuit Protected PPLICATI S LocalTalk Peripherals Notebook/Palmtop Computers Battery-Powered Systems , LTC and LT are registered trademarks of Linear Technology Corporation. AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc TYPICAL A PPLICATI 1 CHARGE PUMP 0. CPEN ...

Page 2

... CC Lead Temperature (Soldering, 10 sec)................. 300 ORDER PART NUMBER LTC1323CG + C1 – C1 TXD TXDEN SHDN RXEN RXDO GND T JMAX ORDER PART NUMBER LTC1323CSW ORDER PART NUMBER TOP VIEW LTC1323CS – – TXD + 6 11 TXD – ...

Page 3

ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Supplies I Normal Operation Supply Current CC Receiver Keep-Alive Supply Current Shutdown Supply Current V Negative Supply Output Voltage EE f Charge Pump Oscillator Frequency OSC Differential Driver V Differential Output Voltage OD V Change in ...

Page 4

LTC1323 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Logic Inputs V Input High Voltage IH V Input Low Voltage IL I Input Current C Switching Characteristics Differential Driver Propagation Delay PLH PHL Differential Driver Propagation Delay with Single-Ended Load Single-Ended ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Charge Pump Output Voltage vs Load Current –2 25° –2 100 L(DIFF GND L(SE) –3 TXI –3.5 – 4.0 ...

Page 6

... SHDN: Shutdown Input (TTL compatible). When this pin is high, the chip is shut down. All driver and receiver outputs are three-state, the charge pump turns off, and the supply current drops to 0 low level on this pin allows normal operation. 6 LTC1323CSW + CHARGE PUMP – ...

Page 7

CTIO S TXO: Single-Ended Driver Output. + TXD : Differential Driver Noninverting Output. – TXD : Differential Driver Inverting Output Negative Supply Charge Pump Output. Requires bypass capacitor to ...

Page 8

LTC1323 U SWITCHI G WAVEFOR S 3V TXDEN – TXD , TXD – + TXD , TXD 0V 3V TXD – TXD TXD V OL ...

Page 9

U SWITCHI G WAVEFOR RXI, RXI RXI RXI V 3V RXEN 0V 5V RXO, RXO, RXDO RXO, RXO, RXDO APPLICATIO S I ...

Page 10

LTC1323 U U APPLICATIO S I FOR ATIO Driving Differential AppleTalk or Single-Ended Loads The differential driver is able to drive either an AppleTalk load or a single-ended load such as a printer or modem. With a differential AppleTalk load, ...

Page 11

... V CC EXTERNAL CHIP GND VEE –4.5V LTC1323 • F15 N Typical LocalTalk Connection 0.33 F CHARGE PUMP LTC1323CS 12 3 DATA ENABLE 5 SHDN 6 RX ENABLE 10 7 DATA OUT LTC1323 FERRITE BEAD FERRITE BEAD 100pF 100pF (a) (b) Figure 16 ...

Page 12

... LT/GP 1194 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 0.150 – 0.157** (3.810 – 3.988) S16 0695 0.394 – 0.419 (10.007 – 10.643) S24 (WIDE) 0695 ...

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