Datasheet

LTC1955
2
1955fd
For more information www.linear.com/LTC1955
pin conFiguraTionabsoluTe MaxiMuM raTings
V
BATT
, DV
CC
, CPO, FAULT,
UNDERV to GND ....................................... –0.3V to 6.0V
PRES A/PRES B, DATA, R
IN
, SYNC, ASYNC,
LD, D
IN
, SCLK to GND .................–0.3V to (DV
CC
+ 0.3V)
I/O A ............................................ –0.3V to (V
CCA
+ 0.3V)
I/O B ............................................ –0.3V to (V
CCB
+ 0.3V)
I
VCCA
/IV
CCB
.............................................................80mA
V
CCA
/V
CCB
Short-Circuit Duration ..................... Indefinite
Operating Temperature Range (Note 4).... –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
32
33
SGND
31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1DV
CC
PRES A
C8A
C4A
I/O A
RST A
CLK A
V
CCA
FAULT
UNDERV
NC/NO
PRES B
I/O B
RST B
CLK B
V
CCB
SYNC ASYNC R
IN
DATA D
OUT
D
IN
SCLK LD
SGND PGND
C
–
SV
BATT
PV
BATT
C
+
CPO
NC
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1955EUH#PBF LTC1955EUH#TRPBF 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC1955IUH#PBF LTC1955IUH#TRPBF 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1955EUH LTC1955EUH#TR 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC1955IUH LTC1955IUH#TR 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Power Supply
V
BATT
Operating Voltage
l
2.7 5.5 V
I
PVBATT
+ I
SVBATT
Operating Current V
CCA
= 5V, V
CCB
= 0V, I
CCA
= 0µA
V
CCA
= V
CCB
= 5V, I
CCA
= I
CCB
= 0µA
l
l
250
350
400
500
µA
µA
I
PVBATT
+ I
SVBATT
Shutdown Current No Cards Present. V
CPO
= 0V
l
0.75 1.75 µA
DV
CC
Operating Voltage
l
1.7 5.5 V
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
PVBATT
= V
SVBATT
= 3.3V, DV
CC
= 3.3V, unless otherwise noted.