Linear Technology LTC1545 Datasheet

FEATURES

■

Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21

■

TUV/Detecon Inc. Certified NET1 and NET2
Compliant (Test Report No. NET2/071601/98)

■

TBR2 Compliant (Test Report No. CTR2/071601/98)

■

Software-Selectable Cable Termination Using
the LTC1344A

■

Complete DTE or DCE Port with LTC1543, LTC1344A

■

Operates from Single 5V Supply with LTC1543

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APPLICATIO S

■

Data Networking

■

CSU and DSU

■

Data Routers

LTC1545

Software-Selectable

Multiprotocol Transceiver

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DESCRIPTIO

The LTC®1545 is a 5-driver/5-receiver multiprotocol trans­ceiver. The LTC1545 and LTC1543 form the core of a
complete software-selectable DTE or DCE interface port that
supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36
or X.21 protocols. Cable termination may be implemented
using the LTC1344A software-selectable cable termination
chip or by using existing discrete designs.

The LTC1545 runs from a 5V supply and the charge pump on
the LTC1543. The part is available in a 36-lead SSOP surface
mount package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

DTE or DCE Multiprotocol Serial Interface with DB-25 Connector

LLRITMRL

D4D5

R3

CTS A (106)

CTS B

R2 R1

DSR A (109)

DSR B

R5

TM A (142)

RL A (140)

R4

LL A (141)

RI A (125)

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LTC1545

D3

DCD A (107)

DCD B

DTRDSR DCDCTS

D2 D1

DTR A (108)

DTR B

RTS

RTS B

RTS A (105)

SHIELD (101)

RXD B

SG (102)

RXCRXD

R2

RXC A (115)

RXC B

RXD A (104)

R1R3

LTC1543

D3

TXC A (114)

TXC B

D2

SCTE A (113)

SCTE B

TXDSCTETXC

D1

1424111512179314192062322513 81018*21 25 7 16

TXD A (103)

TXD B

LTC1344A

2

*OPTIONAL

DB-25 CONNECTOR

1545 TA01

1

LTC1545

WW

W

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ABSOLUTE MAXIMUM RATINGS

(Note 1)

Supply Voltage

VCC..................................................................... 6.5V

VEE........................................................ –10V to 0.3V

VDD....................................................... –0.3V to 10V

Input Voltage

Transmitters ........................... –0.3V to (VCC + 0.3V)

Receivers............................................... –18V to 18V

Logic Pins .............................. –0.3V to (VCC + 0.3V)

Output Voltage

Transmitters .................. (VEE – 0.3V) to (VDD + 0.3V)

Receivers................................ –0.3V to (VCC + 0.3V)

Short-Circuit Duration

Transmitter Output ..................................... Indefinite

Receiver Output.......................................... Indefinite

VEE.................................................................. 30 sec

Operating Temperature Range

LTC1545C .............................................. 0°C to 70°C

LTC1545I........................................... –40°C to 85°C

Storage Temperature Range ................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

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PACKAGE/ORDER INFORMATION

TOP VIEW

V

1

CC

V

2

DD

D1

M0
M1
M2

DCE/DTE

D4ENB

R4EN

3

D2

4

D3

5

R1

6

R2

7

R3

8

D4

9

R4

10
11
12
13
14
15
16

R5

17

D5

18

T

JMAX

D1

D2

D3

R1

R2

R3

D4

R4

R5

D5

G PACKAGE

36-LEAD PLASTIC SSOP

= 150°C, θJA = 65°C/ W

Consult factory for Military grade parts.

36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19

V

EE

GND
D1 A
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
R2 A
R2 B
R3 A
R3 B
D4 A
R4 A
R5 A
D5 A
V

DD

V

CC

ORDER PART

NUMBER

LTC1545CG
LTC1545IG

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ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = 5V, VDD = 8V, VEE = – 7V for V.28, –5.5V for V.10, V.11 (Notes 2, 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies

I

CC

I

EE

I

DD

P

D

VCC Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load ● 2.7 5 mA
All Digital Pins = GND or V

) RS530, RS530-A, X.21 Modes, Full Load ● 110 150 mA

CC

V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode, D4ENB = HIGH

● 13 mA

● 13 mA

● 10 500 µA

VEE Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load ● 2.0 4.0 mA
All Digital Pins = GND or V

) RS530, X.21 Modes, Full Load ● 23 35 mA

CC

RS530-A, Full Load
V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode, D4ENB = HIGH

● 34 50 mA

● 13 mA

● 12 18 mA

● 10 500 µA

VDD Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, NoLoad ● 0.3 2 mA
All Digital Pins = GND or V

) RS530, RS530-A, X.21 Modes, Full Load ● 0.3 2 mA

CC

V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode, D4ENB = HIGH

● 13 mA

● 13.5 18 mA

● 10 500 µA

Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 340 mW
(All Digital Pins = GND or V

) V.28 Mode, Full Load 64 mW

CC

2

LTC1545

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = 5V, VDD = 8V, VEE = – 7V for V.28, –5.5V for V.10, V.11 (Notes 2, 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Logic Inputs and Outputs

V

IH

V

IL

I

IN

V

OH

V

OL

I

OSR

I

OZR

V.11 Driver

V

ODO

V

ODL

∆V

V

OC

∆V

I

SS

I

OZ

tr, t

t

PLH

t

PHL

∆t Input to Output Difference, t

t

SKEW

V.11 Receiver

V

TH

∆V
I

IN

R

IN

tr, t
t

PLH

t

PHL

∆t Input to Output Difference, t

Logic Input High Voltage ● 2V
Logic Input Low Voltage ● 0.8 V
Logic Input Current D1, D2, D3, D4, D5 ● ±10 µA

M0, M1, M2, DCE, D4ENB, R4EN = GND (LTC1545C) ● –100 –50 – 30 µA
M0, M1, M2, DCE, D4ENB, R4EN = GND (LTC1545I) ● –120 –50 – 30 µA
M0, M1, M2, DCE, D4ENB, R4EN = V

CC

● ±10 µA

Output High Voltage IO = –4mA ● 3 4.5 V
Output Low Voltage IO = 4mA ● 0.3 0.8 V
Output Short-Circuit Current 0V ≤ VO ≤ V

CC

Three-State Output Current M0 = M1 = M2 = VCC, 0V ≤ VO ≤ V

CC

● –50 40 50 mA

±1 µA

Open Circuit Differential Output Voltage RL = 1.95k (Figure 1) ● ±5V
Loaded Differential Output Voltage RL = 50Ω (Figure 1) 0.5V

ODO

0.67V

ODO

RL = 50Ω (Figure 1) ● ±2V

Change in Magnitude of Differential RL = 50Ω (Figure 1) ● 0.2 V

OD

Output Voltage
Common Mode Output Voltage RL = 50Ω (Figure 1) ● 3V
Change in Magnitude of Common Mode RL = 50Ω (Figure 1) ● 0.2 V

OC

Output Voltage
Short-Circuit Current V

= GND ±150 mA

OUT

Output Leakage Current –0.25V ≤ VO ≤ 0.25V, Power Off or ● ±1 ±100 µA

No-Cable Mode or Driver Disabled

Rise or Fall Time LTC1545C (Figures 2, 5) ● 21525 ns

f

LTC1545I (Figures 2, 5) ● 21535 ns

Input to Output LTC1545C (Figures 2, 5) ● 20 40 65 ns

LTC1545I (Figures 2, 5) ● 20 40 75 ns

Input to Output LTC1545C (Figures 2, 5) ● 20 40 65 ns

LTC1545I (Figures 2, 5) ● 20 40 75 ns

– t

PLH

 LTC1545C (Figures 2, 5) ● 0312 ns

PHL

LTC1545I (Figures 2, 5) ● 0317 ns

Output to Output Skew (Figures 2, 5) 3 ns

Input Threshold Voltage –7V ≤ VCM ≤ 7V ● –0.2 0.2 V
Input Hysteresis –7V ≤ VCM ≤ 7V ● 15 40 mV

TH

Input Current (A, B) –10V ≤ V
Input Impedance –10V ≤ V
Rise or Fall Time (Figures 2, 6) 15 ns

f

≤ 10V ● ±0.66 mA

A,B

≤ 10V ● 15 30 kΩ

A,B

Input to Output LTC1545C (Figures 2, 6) ● 50 80 ns

LTC1545I (Figures 2, 6) ● 50 90 ns

Input to Output LTC1545C (Figures 2, 6) ● 50 80 ns

LTC1545I (Figures 2, 6) ● 50 90 ns

– t

PLH

 LTC1545C (Figures 2, 6) ● 0416 ns

PHL

LTC1545I (Figures 2, 6) ● 0421 ns

3

LTC1545

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = 5V, VDD = 8V, VEE = – 7V for V.28, –5.5V for V.10, V.11 (Notes 2, 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V.10 Driver

V

O

V

T

I

SS

I

OZ

tr, t

f

t

PLH

t

PHL

V.10 Receiver

V

TH

∆V

TH

I

IN

R

IN

tr, t

f

t

PLH

t

PHL

∆t Input to Output Difference, t

V.28 Driver

V

O

I

SS

I

OZ

SR Slew Rate RL = 3k, CL = 2500pF (Figures 3, 7) ● 430V/µs
t

PLH

t

PHL

V.28 Receiver

V

THL

V

TLH

∆V

TH

R

IN

tr, t

f

t

PLH

t

PHL

Output Voltage Open Circuit, RL = 3.9k ● ±4 ±6V
Output Voltage RL = 450Ω (Figure 3) ● ±3.6 V

= 450Ω (Figure 3) 0.9V

R

L

O

Short-Circuit Current VO = GND ±150 mA
Output Leakage Current –0.25V ≤ VO ≤ 0.25V, Power Off or ● ±0.1 ±100 µA

No-Cable Mode or Driver Disabled
Rise or Fall Time RL = 450Ω, CL = 100pF (Figures 3, 7) 2 µs
Input to Output RL = 450Ω, CL = 100pF (Figures 3, 7) 1 µs
Input to Output RL = 450Ω, CL = 100pF (Figures 3, 7) 1 µs

Receiver Input Threshold Voltage ● –0.25 0.25 V
Receiver Input Hysteresis ● 25 50 mV
Receiver Input Current –10V ≤ VA ≤ 10V ● ±0.66 mA
Receiver Input Impedance –10V ≤ VA ≤ 10V ● 15 30 kΩ
Rise or Fall Time (Figures 4, 8) 15 ns
Input to Output (Figures 4, 8) 55 ns
Input to Output (Figures 4, 8) 109 ns

– t

PLH

 (Figures 4, 8) 60 ns

PHL

Output Voltage Open Circuit ● ±10 V

R

= 3k (Figure 3) ● ±5 ±8.5 V

L

Short-Circuit Current VO = GND ● ±150 mA
Output Leakage Current –0.25V ≤ VO ≤ 0.25V, Power Off or ● ±1 ±100 µA

No-Cable Mode or Driver Disabled

Input to Output RL = 3k, CL = 2500pF (Figures 3, 7) ● 1.3 2.5 µs
Input to Output RL = 3k, CL = 2500pF (Figures 3, 7) ● 1.3 2.5 µs

Input Low Threshold Voltage ● 1.5 0.8 V
Input High Threshold Voltage ● 2 1.6 V
Receiver Input Hysterisis ● 0.1 0.3 V
Receiver Input Impedance –15V ≤ VA ≤ 15V ● 357 kΩ
Rise or Fall Time (Figures 4, 8) 15 ns
Input to Output (Figures 4, 8) ● 60 100 ns
Input to Output (Figures 4, 8) ● 150 450 ns

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: All currents into device pins are positive; all currents out of device
are negative. All voltages are referenced to device ground unless otherwise
specified.

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Note 3: All typicals are given for V
–5.5V for V.10, V.11 and T

= 25°C.

A

= 5V, VDD = 8V, VEE = –7V for V.28,

CC

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PIN FUNCTIONS

LTC1545

VCC (Pins 1, 19): Positive Supply for the Transceivers.

4.75V ≤ VCC ≤ 5.25V. Connect a 1µF capacitor to ground.
VDD (Pins 2, 20): Positive Supply Voltage for V.28. Con-

nect to VDD Pin 3 on LTC1543 or 8V supply. Connect a 1µF
capacitor to ground.

D1 (Pin 3): TTL Level Driver 1 Input.
D2 (Pin 4): TTL Level Driver 2 Input.
D3 (Pin 5): TTL Level Driver 3 Input.
R1 (Pin 6): CMOS Level Receiver 1 Output.
R2 (Pin 7): CMOS Level Receiver 2 Output.
R3 (Pin 8): CMOS Level Receiver 3 Output.
D4 (Pin 9): TTL Level Driver 4 Input.
R4 (Pin 10): CMOS Level Receiver 4 Output.
M0 (Pin 11): TTL Level Mode Select Input 0 with Pull-Up

to VCC.
M1 (Pin 12): TTL Level Mode Select Input 1 with Pull-Up

to VCC.

R5 (Pin 17): CMOS Level Receiver 5 Output.
D5 (Pin 18): TTL Level Driver 5 Input.
D5 A (Pin 21): Driver 5 Output.
R5 A (Pin 22): Receiver 5 Input.
R4 A (Pin 23): Receiver 4 Input.
D4 A (Pin 24): Driver 4 Input.
R3 B (Pin 25): Receiver 3 Noninverting Input.
R3 A (Pin 26): Receiver 3 Inverting Input.
R2 B (Pin 27): Receiver 2 Noninverting Input.
R2 A (Pin 28): Receiver 2 Inverting Input.
D3/R1 B (Pin 29): Receiver 1 Noninverting Input and

Driver 3 Noninverting Output.
D3/R1 A (Pin 30): Receiver 1 Inverting Input and Driver 3

Inverting Output.

D2 B (Pin 31): Driver 2 Noninverting Output.
D2 A (Pin 32): Driver 2 Inverting Output.

M2 (Pin 13): TTL Level Mode Select Input 2 with Pull-Up

to VCC.
DCE/DTE (Pin 14): TTL Level Mode Select Input with

Pull-Up to VCC. Logic high enables Driver 3. Logic low
enables Receiver 1.

D4ENB (Pin 15): TTL Level Enable Input with Pull-Up to
VCC. Logic low enables Driver 4.

R4EN (Pin 16): TTL Level Enable Input with Pull-Up to VCC.
Logic high enables Receiver 4.

TEST CIRCUITS

A

R

L

V

OD

V

OC

R

L

B

1545 F01

D1 B (Pin 33): Driver 1 Noninverting Output.
D1 A (Pin 34): Driver 1 Inverting Output.
GND (Pin 35): Ground.
V

(Pin 36): Negative Supply Voltage. Connect to VEE Pin

EE

26 on LTC1543. Connect a 1µF capacitor to ground.

C

L

B

R

L

100Ω

A

100pF

C
100pF

B

R

L

A

15pF

1545 F02

Figure 1. V.11 Driver Test Circuit Figure 2. V.11 Driver/Receiver AC Test Circuit

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