Datasheet
LTC1955
22
1955fd
For more information www.linear.com/LTC1955
LINEAR TECHNOLOGY CORPORATION 2002
LT 0214 REV D • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC1955
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LTC1755/LTC1756 ISO 7816-3 and EMV Compatible Smart Card Interface V
OUT
= 3V/5V, V
IN
= 2.7V to 6V, SSOP-16/-24 Package
LTC1555 SIM Power Supply and Level Translator Step-Up/Step-Down
Charge Pump
V
OUT
= 3V/5V, V
IN
= 2.7V to 10V, SSOP-16/-20 Package
LTC1555L-1.8 SIM Power Supply and Level Translator Step-Up/Step-Down
Charge Pump
V
OUT
= 1.8V/3V/5V, V
IN
= 2.6V to 6V, SSOP-16 Package
LTC4555 SIM Power Supply and Level Translator
V
OUT
= 1.8V/3V, V
IN
= 3V to 6V, 3mm × 3mm QFN Package
LTC4556 SIM Power Supply and Level Translator
V
OUT
= 1.8V/3V, V
IN
= 3V to 6V, 3mm × 3mm QFN Package
LTC4557 SIM Power Supply and Level Translator
V
OUT
= 1.8V/3V, V
IN
= 3V to 6V, 3mm × 3mm QFN Package
CARD A
CARD B
LTC1955EUH
1µF
D
IN
DV
CC
V
CC
UNDERV V
BATT
ASYNC
D
OUT
SYNC
SCLK
R
IN
LD
DATA
I/O B
RST B
CLK B
V
CCB
I/O A
C4A
C8A
RST A
CLK A
V
CCA
CPOV
–
GND NC/NOC
–
11 14 15
C
+
FAULT
1955 TA02
24
2314 12, 13
27
28
26
25
31
32
30
29
42
41
43
44
24
8
9
1
5
4
3
6
7
8
20
19
18
PRES B
PRES A
2
21
17
C7
C4
C8
C2
C3
C1
C7
C2
C3
C1
9, 10 22
4.7µF
28 15
0.1µF
V
+
1
5
0.1µF
1µF
1µF
0.1µF
0.1µF
C5
C5
RD
TD
GND
DB9
0.1µF
1k
0.1µF
XIRQ
19 37
0.1µF
180k
Li-ION
4.7µF
262k
+
RST
2
136
V
CC18
4 5
V
CC3
3
V
CCA
GND
LTC1728ES5-1.8
DREN
17
RXEN
16
MOD B
21
V
DD
V
RH
45
22 26 2718 20
XTALEXTALV
RL
V
SS
GND MODA
47k
RST
47k
RESET
FAULT
(MOSI) PD3
38
IRQ
(2MHz) E
(MISO) PD2
25
24
40
39
DR1IN
RX1OUT
7
8
2
3
DR1OUT
RX1IN
PD1 (TXD)
PD0 (RXD)
PB1
(SCK) PD4
PB0
(SS) PD5
(IC3) PA0
28
PC0
0.1µF
3
C2
–
2
C2
+
0.1µF
6
C1
–
5
C1
+
0.1µF
26
C3
–
27
C3
+
10M
8.000MHz
27pF27pF
MC68L11E9PB2LTC1348CG
Battery-Powered RS232 to Dual Smart Card Interface