DS8024 Maxim, DS8024 Datasheet - Page 14

• Manufacturer Part Number: DS8024
• Description: The DS8024 smart card interface IC is a low-cost, analog front-end for a smart card reader, designed for all ISO 7816, EMV®, and GSM11-11 applications
• Manufacturer: Maxim

Smart Card Interface
Performance can be affected by the layout of the appli-
cation. For example, an additional cross-capacitance of
1pF between card reader contacts C2 (RST) and C3
(CLK) or C2 (RST) and C7 (I/O) can cause contact C2
to be polluted with high-frequency noise from C3 (or
C7). In this case, include a 100pF capacitor between
contacts C2 and CGND.
Application recommendations include the following:
14
• Ensure there is ample ground area around the
• The DS8024 and the host microcontroller must use
• Trace C3 (CLK) should be placed as far as possi-
• The trace connecting CGND to C5 (GND) should
• Avoid ground loops among CGND, PGND, and
• Decouple V
______________________________________________________________________________________
DS8024 and the connector; place the DS8024
very near to the connector; decouple the V
V
tioned under the connector.
the same V
RSTIN, PRES, AUX1IN, I/OIN, AUX2IN, 5V/3V,
CMDVCC, and OFF are referenced to V
XTAL1 is to be driven by an external clock, also
reference this pin to V
ble from the other traces.
be straight (the two capacitors on C1 (V
be connected to this ground trace).
GND.
supplies are the same in the application, they
should be connected in a star on the main trace.
DDA
lines separately. These lines are best posi-
Applications Information
DD
DDA
supply. Pins CLKDIV1, CLKDIV2,
and V
DD
DD
.
separately; if the two
CC
DD
) should
DD
; if pin
and
With all these layout precautions, noise should be kept
to an acceptable level and jitter on C3 (CLK) should be
less than 100ps.
For technical support, go to
ic.com/micro.
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Note: Contact the factory for availability of other variants and
package options.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
28 SO (300 mils)
DS8024-RJX+
DS8024-RJX/V+
DS8024-RRX+
• Connect a 100nF capacitor (ESR < 100mΩ)
• Connect a 100nF or 220nF capacitor (220nF pre-
PACKAGE
28 TSSOP
between V
DS8024’s V
ferred, ESR < 100mΩ) between V
and place near the smart card socket’s C1 contact.
TYPE
PART
SUPPORTED (V)
CC
CC
PACKAGE
VOLTAGES
W28+6
CURRENT
U28+1
CODE
pin.
3.0, 5.0
3.0, 5.0
3.0, 5.0
and CGND and place near the
Package Information
Technical Support
OUTLINE NO.
https://support.maxim-
Selector Guide
21-0042
21-0066
SUPPORTS
MODE?
STOP
No
No
No
CC
PATTERN NO.
and CGND
PIN-
PACKAGE
28 TSSOP
28 TSSOP
28 SO
90-0109
90-0171
LAND