DS8007A Maxim, DS8007A Datasheet - Page 9

• Manufacturer Part Number: DS8007A
• Description: The DS8007A multiprotocol dual smart card interface is an automotive grade, low-cost, dual smart card reader interface supporting all ISO 7816, EMV™, and GSM11-11 requirements
• Manufacturer: Maxim

AC ELECTRICAL SPECIFICATIONS—TIMING PARAMETERS FOR CONSECUTIVE
READ/WRITE TO URR/UTR/TOC
(V
Note 4: Depends on the leading edge of WR or CS (whichever is deasserted first). Reference this specification to the rising edge
Note 5: PSC is the programmed prescaler value (31 or 32).
Figure 3. Timing Between Two Read Operations in Register URR
SEE FIGURE 3
RD Pulse Width
RD Low to Bit CRED = 1
Set Time Bit FE
Set Time Bit RBF
SEE FIGURE 4
WR/CS Pulse Width
WR/CS Low to I/Ox Low
SEE FIGURE 5
WR/CS Pulse Width
WR/CS High to Bit CRED = 1
CRED BIT
DD
RBF BIT
FE BIT
I/Ox
= 3.3V, V
INT
RD
of CS/WR instead of the falling edge.
PARAMETER
DDA
= 3.3V, T
_______________________________________________________________________________________
Multiprotocol Dual Smart Card Interface
t
SB(FE)
A
= +25°C, unless otherwise noted.)
SYMBOL
t
t
t
t
RD(URR)
WR(UTR)
WR(TOC)
t
SB(RBF)
t
t
t
SB(FE)
W(WR)
W(WR)
W(RD)
(Note 4)
(Notes 4 and 5)
t
SB(RBF)
CONDITIONS
t
W(RD)
t
RD(URR)
2t
2t
t
t
1 / PSC
W(WR)
W(RD)
CY(CLK)
CY(CLK)
10.5
10.5
MIN
10
10
10
+
+
TYP
3t
3t
t
t
W(WR)
W(RD)
2 / PSC
CY(CLK)
CY(CLK)
MAX
+
+
UNITS
ETU
ETU
ETU
ns
ns
ns
ns
ns
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