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LTC1755 Datasheet

  • LTC1755

  • Smart Card Interface

  • 12頁

  • LINER

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Final Electrical Specifications
LTC1755
Smart Card Interface
October 1999
FEATURES
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DESCRIPTION
The LTC
廬
1755 universal Smart Card interface is fully
compliant with ISO 7816-3 and EMV specifications. It
provides the smallest and simplest interface circuit be-
tween a host microcontroller and general purpose Smart
Cards.
An internal charge pump DC/DC converter delivers regu-
lated 3V or 5V to the Smart Card, while on-chip level
shifters allow connection to a low voltage controller. All
Smart Card contacts are rated for 10kV ESD, eliminating
the need for external ESD protection devices.
Input voltage may range from 2.7V to 6.0V, allowing direct
connection to a battery. Automatic DC/DC converter soft
start mitigates start-up problems that may result when the
input power is provided by another regulator. Multiple
LTC1755 devices may be paralleled and connected to a
single controller for multicard applications.
Battery life is maximized by 60碌A(chǔ) operating current and
1碌A(chǔ) shutdown current. The 24-pin SSOP package mini-
mizes PCB area for compact portable systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Fully ISO 7816-3 and EMV Compliant
(Including Auxiliary I/O Pins)
Buck-Boost Charge Pump Generates 3V or 5V
2.7V to 6.0V Input Voltage Range
Very Low Operating Current: 60碌A(chǔ)
> 10kV ESD on All Smart Card Pins
Dynamic Pull-Ups Deliver Fast Signal Rise Times
Soft Start Limits Inrush Current at Turn On
3V
鈫?/div>
5V Signal Level Translators
Shutdown Current: < 1碌A(chǔ)
Short-Circuit and Overtemperature Protected
Alarm Output Indicates Fault Condition
Multiple Devices May Be Paralleled for
Multicard Applications
Available in 24-Pin SSOP Package
APPLICATIONS
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Handheld Payment Terminals
Pay Telephones
ATMs
Key Chain Readers
Smart Card Readers
TYPICAL APPLICATION
SMART CARD
PRESENT SWITCH
1
2
3
4
C3
10碌F
GND
V
CC
AUX1
SMART CARD
AUX2
I/O
RST
CLK
C2
10碌F
5
6
7
8
9
10
11
12
3.3V
PRES
PWR
CS
NC/NO
GND
5V/3V
CARD
ALARM
READY
DV
CC
C
+
AUX1IN
AUX2IN
DATA
RIN
CIN
24
23
22
21
20
19
18
17
16
15
14
13
1755 TA01
V
IN
LTC1755 C
鈥?/div>
V
CC
AUX1
AUX2
I/O
RST
CLK
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
U
C1
0.68碌F
碌CONTROLLER
1

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