73S8009R-IL/F Maxim Integrated Products, 73S8009R-IL/F Datasheet - Page 17

• Manufacturer Part Number: 73S8009R-IL/F
• Description: IC SMART CARD LEVEL SHIFT 28SOIC
• Manufacturer: Maxim Integrated Products
• Type: Low Cost Versatile Smart Card Interfacer

Specifications of 73S8009R-IL/F

• Applications: Smart Card Reader, Writer
• Voltage - Supply: 2.7 V ~ 3.6 V
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

DS_8009R_056
73S8009R Data Sheet
OFF is low by
OFF is low by
card extracted
any fault
PRES
OFF
CMDVCC
VCC
outside card session
within card session
within card
session
Figure 7: OFF Activity Outside and Inside a Card Session
3.8
Power-down Operation
A power-down function is provided that disables all analog functions. The power-down state is only
allowed in the de-activated condition. The host invokes the power-down state when it is desirable to save
power.
The signals PRES and PRES are functional in the power-down state so that a card insertion asserts OFF
high. If there is no card present (OFF = low) in power-down mode, the pull-up resistor is disabled so that
no current is drawn from VDD. If a card is inserted, the pull-up resistor is enabled and OFF goes high.
Upon receiving the OFF indication, the host must then de-assert power down (PWRDN) and wait until the
circuit is ready. When PWRDN is de-asserted, OFF goes low to indicate that the circuit is not ready (it is
going through the power-on recovery time). When the circuit is ready, OFF will go high if the card is
present.
Figure 8
illustrates the behavior of the circuit for PWRDN events.
OFF will go high if card is present and there are no faults
PRES
OFF goes low when PWRDN is de-asserted while circuit starts up
OFF going high indicates
OFF
circuit is ready
PWRDN while CMDVCCx=0
PWRDN
has no effect
PWRDN will have effect
when CMDVCCx=1
RC OSC
~30 µs
Controller must wait for OFF=1 after
~30 µs
setting PWRDN=0 before setting
CMDVCC(3/5)=0
CMDVCC3 /
CMDVCC5
RDY - indicates VCC is OK
Figure 8: Power-down Operation
Rev. 1.3
17