73S8014R Maxim, 73S8014R Datasheet - Page 19

• Manufacturer Part Number: 73S8014R
• Description: The 73S8014R/RN devices are single smart card (ICC) interface circuits, firmware compatible with 8024-type devices for configurations where only asynchronous cards are to be supported, and are derived from the 73S8024RN industry standard electrical i
• Manufacturer: Maxim

3.7 Deactivation Sequence
Deactivation is initiated either by the system controller by setting the CMDVCC high, or automatically in the event of
hardware faults. Hardware faults are over-current, VDD fault, VCC fault, and card extraction during the session.
The following steps show the deactivation sequence and the timing of the card control signals when the system
controller sets the CMDVCC high or OFF goes low due to a fault or card removal:
Rev. 1.0
-
-
-
-
RST goes low at the end of t
CLK is set low at the end of t
I/O goes low at the end of t
VCC is shut down at the end of time t
CMDVCC
CMDVCC
t
t
t
1
2
3
RSTIN
= 0.510 ms (timing by 1.5MHz internal oscillator, I/O goes to reception state)
= RSTIN goes low and CLK becomes active
= > 0.5μs, CLK active, RST to become the copy of RSTIN
VCC
RST
Figure 5: Activation Sequence – RSTIN High When CMDVCC Goes Low
OFF
RST
VCC
CLK
CLK
I/O
I/O
t
t
t
t
t
1
2
3
4
5
= > 0.5μs, timing by 1.5MHz internal Oscillator
= > 7.5μs
= > 0.5μs
= > 0.5μs
= depends on VCC filter capacitor.
-- OR --
3
. Out of reception mode.
1
2
t
.
.
0
Figure 6: Deactivation Sequence
t
1
4
. After a delay t
t
2
t
1
t
3
5
(discharge of the VCC capacitor), VCC is low.
t
4
t
2
t
5
19