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LTC4556EUF Datasheet

  • LTC4556EUF

  • Smart Card Interface with Serial Control

  • 243.26KB

  • 20頁

  • LINER

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LTC4556
Smart Card Interface
with Serial Control
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Electrical Specifications Are ISO7816-3 and EMV
Compatible
Control/Status Serial Port May be Daisy-Chained
for Multicard Applications
Automatic Shutdown on Electrical Faults
Buck Boost Charge Pump Generates 5V, 3V or 1.8V
Outputs (Smart Card Classes A, B and C)
Automatic Level Translation
Dynamic Pull-Ups Deliver Fast Signal Rise Times*
Supervisory Functions Prevent Smart Card Faults
Low Operating Current: 250碌A(chǔ) Typical
V
IN
: 2.7V to 5.5V
Ultralow Shutdown Current
>10kV ESD on Smart Card Pins
Small 24-Pin 4mm
脳
4mm QFN Package
The LTC
廬
4556 provides all necessary power control, level
translation and supervisory functions for a smart card or
S.A.M. card interface. The part contains a low noise charge
pump** plus LDO for generating V
CC
power, as well as all
necessary level shifting circuitry.
The card voltage can be set to either 1.8V, 3V or 5V. The
LTC4556 includes a card detection channel with automatic
debounce circuitry. To reduce wiring costs, the LTC4556
interfaces to a microcontroller via a simple 4-wire serial
interface. Multiple devices may be connected in daisy-
chain fashion so that the number of wires to the card
socket board is independent of the number of sockets.
Status data is returned over the same interface.
Extensive security features ensure proper deactivation
sequencing in the event of a supply fault or a smart card
electrical fault. The smart card pins can withstand greater
than 10kV ESD in-situ with no additional components.
The LTC4556 is available in a small, low profile (0.75mm),
4mm
脳
4mm QFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. Patent No. 6,356,140
**U.S. Patent No. 6,411,531
APPLICATIO S
s
s
s
s
s
s
Handheld Payment Terminals
Pay Telephones
ATM Machines
POS Terminals
Computer Keyboards
Multiple S.A.M. Sockets
TYPICAL APPLICATIO
240k
1
10
INPUT
POWER
0.1碌F
1碌F
8
6
21
4-WIRE
COMMAND
INTERFACE
22
23
24
DV
CC
V
BATT
180k
20
UNDERV
PRES
LTC4556
19
GND
FAULT
D
IN
D
OUT
SCLK
LD
C8
C4
I/O
RST
CLK
V
CC
18
17
16
15
14
13
1碌F
4556
TA01
SMART CARD
2
4-WIRE
CARD
INTERFACE
3
4
5
DATA
R
IN
SYNC
ASYNC
C
+
C
鈥?/div>
11
9
CPO
12
1碌F
1碌F
U
Deactivation Sequence
RST
5V/DIV
CLK
5V/DIV
I/O
5V/DIV
V
CC
5V/DIV
10碌s/DIV
4556 G11.eps
U
U
4556f
1

LTC4556EUF 產(chǎn)品屬性

  • LTC4556

  • 91

  • RF/IF 和 RFID

  • RF 其它 IC 和模塊

  • -

  • 電源管理，信號(hào)電平轉(zhuǎn)換

  • -

  • 手機(jī)

  • SIM 和智能卡接口

  • 24-WFQFN 裸露焊盤

  • 管件

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