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DS8024M-RJX+T

P1-P3P4-P6P7-P9P10-P12P13-P15
DS8024
Smart Card Interface
4
RECOMMENDED DC OPERATING CONDITIONS (continued)
(V
DD
= +3.3V, V
DDA
= +5.0V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DATA LINES (I/O AND I/OIN)
I/O I/OIN Falling Edge Delay t
D(IO-IOIN)
(Note 3) 200 ns
Pullup Pulse Active Time t
PU
(Note 3) 100 ns
Maximum Frequency f
IOMAX
1 MHz
Input Capacitance C
I
(Note 3) 10 pF
I/O, AUX1, AUX2 PINS
Output Low Voltage V
OL_IO1
I
OL_IO
= 1mA 0 0.3 V
Output Current I
OL_IO1
V
OL_IO
= 0V 0 -1 mA
Card-Inactive Mode
Internal Pullup
Resistor
R
PU_IO
To V
CC
9 11 19 k
Output Low Voltage V
OL_IO2
I
OL_IO
= 1mA 0 0.3 V
Output High
Voltage
V
OH_IO2
I
OH_IO
= < -40μA (3V/5V) 0.75 x V
CC
V
CC
V
Output Rise/Fall
Time
t
OT
C
L
= 30pF (Note 3) 0.1 μs
Input Low Voltage V
IL_IO
-0.3 +0.8
Input High Voltage V
IH_IO
1.5 V
CC
V
Input Low Current I
IL_IO
V
IL_IO
= 0V 700 μA
Input High Current I
IH_IO
V
IH_IO
= V
CC
20 μA
Input Rise/Fall Time t
IT
(Note 3) 1.2 μs
Current Limitation I
IO(LIMIT)
C
L
= 30pF -15 +15 mA
Card-Active Mode
Current When
Pullup Active
I
PU
C
L
= 80pF, V
OH
= 0.9 x V
DD
(Note 3)
-1 mA
I/OIN, AUX1IN, AUX2IN PINS
Output Low Voltage V
OL
I
OL
= 1mA 0 0.3 V
Output High Voltage V
OH
I
OH
< -40μA
0.75 x
V
DD
V
DD
+
0.1
V
Output Rise/Fall Time t
OT
C
L
= 30pF, 10% to 90% (Note 3) 0.1 μs
Input Low Voltage V
IL
-0.3
0.3 x
V
DD
V
Input High Voltage V
IH
0.7 x
V
DD
V
DD
+
0.3
V
Input Low Current I
IL_IO
V
IL
= 0V 600 μA
Input High Current I
IH_IO
V
IH
= V
DD
10 μA
Input Rise/Fall Time t
IT
V
IL
to V
IH
(Note 3) 1.2 μs
Integrated Pullup Resistor R
PU
Pullup to V
DD
9 11 13 k
Current When Pullup Active I
PU
C
L
= 30pF, V
OH
= 0.9 x V
DD
(Note 3)
-1 mA
DS8024
Smart Card Interface
5
RECOMMENDED DC OPERATING CONDITIONS (continued)
(V
DD
= +3.3V, V
DDA
= +5.0V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CONTROL PINS (CLKDIV1, CLKDIV2, CMDVCC, RSTIN, 5V/3V)
Input Low Voltage V
IL
-0.3
0.3 x
V
DD
V
Input High Voltage V
IH
0.7 x
V
DD
V
DD
+
0.3
V
Input Low Current I
IL_IO
0 < V
IL
< V
DD
5 μA
Input High Current I
IH_IO
0 < V
IH
< V
DD
5 μA
Integrated Pullup Resistor R
PU
Pullup to V
DD
, 5V/3V only 50 85 120 k
INTERRUPT OUTPUT PIN (OFF)
Output Low Voltage V
OL
I
OL
= 2mA 0 0.3 V
Output High Voltage V
OH
I
OH
= -15μA
0.75 x
V
DD
V
Integrated Pullup Resistor R
PU
Pullup to V
DD
12 20 28 k
PRES, PRES PINS
Input Low Voltage V
IL_PRES
0.3 x
V
DD
V
Input High Voltage V
IH_PRES
0.7 x
V
DD
V
Input Low Current I
IL_PRES
V
IL_PRES
= 0V 40 μA
Input High Current I
IH_PRES
V
IH_PRES
= V
DD
40 μA
TIMING
Activation Time t
ACT
160 μs
Deactivation Time t
DEACT
80 μs
Window Start t
3
95
CLK to Card Start
Time
Window End t
5
160
μs
PRES/PRES Debounce Time t
DEBOUNCE
8 ms
Note 1: Operation guaranteed at T
A
= -40°C and T
A
= +85°C, but not tested.
Note 2: IDD_IC measures the amount of current used by the DS8024 to provide the smart card current minus the load.
Note 3: Guaranteed by design, but not production tested.
DS8024
Smart Card Interface
6
Pin Description
PIN NAME FUNCTION
1, 2
CLKDIV1,
CLKDIV2
Clock Divider. Determines the divided-down input clock frequency (presented at XTAL1 or from a
crystal at XTAL1 and XTAL2) on the CLK output pin. Dividers of 1, 2, 4, and 8 are available.
3 5V/3V
5V/3V Selection Pin. Allows selection of 5V or 3V for communication with an IC card. Logic-high selects
5V operation; logic-low selects 3V operation. See Table 3 for a complete description of choosing card
voltages.
4 PGND Analog Ground
5, 7 CP2, CP1
Step-Up Converter Contact. Charge-pump capacitor. Connect a 100nF capacitor (ESR < 100m)
between CP1 and CP2.
6 V
DDA
Charge-Pump Supply. Must be equal to or higher than V
DD
. Connect a supply of at least 3.3V.
8 V
UP
Charge-Pump Output. Connect a 100nF capacitor (ESR < 100m) between V
UP
and GND.
9 PRES
Card Presence Indicator. Active-low card presence inputs. When the presence indicator becomes
active, a debounce timeout begins. After 8ms (typ) the OFF signal becomes active.
10 PRES
Card Presence Indicator. Active-high card presence inputs. When the presence indicator becomes
active, a debounce timeout begins. After 8ms (typ) the OFF signal becomes active.
11 I/O Smart Card Data-Line Output. Card data communication line, contact C7.
12, 13
AUX2,
AUX1
Smart Card Auxiliary Line (C4, C8) Output. Data line connected to card reader contacts C4 (AUX1) and
C8 (AUX2).
14 CGND Smart Card Ground
15 CLK Smart Card Clock. Card clock, contact C3.
16 RST Smart Card Reset. Card reset output from contact C2.
17 V
CC
Smart Card Supply Voltage. Decouple to CGND (card ground) with 2 x 100nF or 100 + 220nF
capacitors (ESR < 100m).
18 N.C. No Connection. Unused on the DS8024.
19 CMDVCC Activation Sequence Initiate. Active-low input from host.
20 RSTIN Card Reset Input. Reset input from the host.
21 V
DD
Supply Voltage
22 GND Digital Ground
23 OFF Status Output. Active-low interrupt output to the host. Use a 20k integrated pullup resistor to V
DD
.
24, 25
XTAL1,
XTAL2
Crystal/Clock Input. Connect an input from an external clock to XTAL1 or connect a crystal across
XTAL1 and XTAL2. For the low idle-mode current variant, an external clock must be driven on XTAL1.
26 I/OIN I/O Input. Host-to-interface chip data I/O line.
27, 28
AUX1IN,
AUX2IN
C4/C8 Input. Host-to-interface I/O line for auxiliary connections to C4 and C8.
P1-P3P4-P6P7-P9P10-P12P13-P15

DS8024M-RJX+T

Mfr. #:
Buy DS8024M-RJX+T
Manufacturer:
Maxim Integrated
Description:
Interface - Specialized Smart Card Interface
Lifecycle:
New from this manufacturer.
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