Datasheet Linear Technology LTC1955 — Ficha de datos

Fabricante	Linear Technology
Serie	LTC1955

Doble interfaz de tarjeta inteligente con control en serie

Hojas de datos

PDF, 374 Kb, Revisión: D, Archivo subido: nov 16, 2017

Extracto del documento

Precios

Embalaje

	LTC1955EUH#PBF	LTC1955EUH#TRPBF	LTC1955IUH#PBF	LTC1955IUH#TRPBF
N	1	2	3	4
Package	5x5 QFN-32 Dibujo del esquema del paquete	5x5 QFN-32 Dibujo del esquema del paquete	5x5 QFN-32 Dibujo del esquema del paquete	5x5 QFN-32 Dibujo del esquema del paquete
Package Code	UH	UH	UH	UH
Package Index	05-08-1693	05-08-1693	05-08-1693	05-08-1693
Pin Count	32	32	32	32

Paramétricos

Parameters / Models	LTC1955EUH#PBF	LTC1955EUH#TRPBF	LTC1955IUH#PBF	LTC1955IUH#TRPBF
Demo Boards	DC465A	DC465A	DC465A	DC465A
Export Control	no	no	no	no
Isupply, mA	0.25	0.25	0.25	0.25
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Output Current, A	0.05	0.05	0.05	0.05
Output Voltage	1.8V,3.0V,5.0V	1.8V,3.0V,5.0V	1.8V,3.0V,5.0V	1.8V,3.0V,5.0V
Vin Max, V	6	6	6	6
Vin Min, V	3	3	3	3

Plan ecológico

	LTC1955EUH#PBF	LTC1955EUH#TRPBF	LTC1955IUH#PBF	LTC1955IUH#TRPBF
RoHS	Obediente	Obediente	Obediente	Obediente

Notas de Diseño

Descargar
Single Interface Chip Controls Two Smart Cards &mdash DN289
PDF, 95 Kb, Archivo publicado: jul 1, 2002
Extracto del documento
Single Interface Chip Controls Two Smart Cards вЂ“ Design Note 289
Steven Martin
Introduction
There are considerable challenges to smart card interfacing, including various voltage levels (both input and
output) and stringent fault handling requirements. To
produce a robust card reading system, designers must
comply with extensive and often difп¬Ѓcult software as
well as hardware standards. Furthermore, there are
other complications like in-circuit ESD and pin-to-pin
shorts to contend with.
The LTC В®1955 dual smart card interface provides all
of the required power management, control, ESD and
fault detection circuitry for two smart cards. Employing
a voltage doubling charge pump and two low dropout
linear regulators, this device generates two independent levels of either 5V, 3V or 1.8V from a 2.7V to 5.5V input. Both channels have the required pins to support
the EMV (Europay, MasterCard, Visa) and the ISO7816
smart card standards. One channel has extra control
pins (smart card contact pad locations C4 and C8)
to support existing memory cards. The entire chip is
controlled by a microcontroller-friendly serial interface.
Features
The LTC1955 includes considerable security and functionality, yet remains easy to use. Two independent
circuits detect the presence or absence of a smart …

Artículos

Descargar
Dual Smart Card Interface Simplifies Multicard Reader Designs &mdash LT Journal
PDF, 355 Kb, Archivo publicado: marzo 1, 2003
Extracto del documento
DESIGN FEATURES Dual Smart Card Interface Simplifies
by Steven Martin
Multicard Reader Designs
Introduction
The LTC1955 dual smart card interface provides a complete and compact
solution for multicard applications.
The LTC1955 and five small capacitors
are all that are needed to interface two
card sockets to a host microcontroller.
Designed to comply with all smart card
standards, the LTC1955 can be used
for full sized card sockets, smaller
vendor card (simlock) sockets, or any
combination of smart card and vendor
card sockets. Figure 1 shows the block diagram
of the LTC1955, which operates from
a battery or a regulated 3.3V supply.
The internal charge pump delivers
a boosted voltage to two on-chip
low dropout regulators. The LDOs
provide programmable 1.8V, 3V or
5V regulated outputs to each of the
smart card sockets. Two unidirectional channels and one bi-directional …

Linea modelo

Serie: LTC1955 (4)

LTC1955EUH#PBF LTC1955EUH#TRPBF LTC1955IUH#PBF LTC1955IUH#TRPBF

Clasificación del fabricante

Interface > SIM Interface

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