DS8007_11 Datasheet, PDF (7/41 Pages) Maxim Integrated Products – Multiprotocol Dual Smart Card Interface 8kV (min) ESD Protection on Card Interfaces

Multiprotocol Dual Smart Card Interface
AC ELECTRICAL SPECIFICATIONS—TIMING PARAMETERS FOR MULTIPLEXED
PARALLEL BUS
(V_DD = 3.3V, V_DDA = 3.3V, T_A = +25°C, unless otherwise noted.) (Figure 1)
PARAMETER
XTAL1 Cycle Time
ALE Pulse Width
Address Valid to ALE Low
ALE Low to RD or WR Low
RD Pulse Width
RD Low to Data Read Valid
WR/RD High to ALE High
WR Pulse Width
Data Write Valid to WR Low
SYMBOL
t_CY(XTAL1)
t_W(ALE)
t_AVLL
t_(AL-RWL)
t_W(RD)
t_(RL-DV)
t_(RWH-AH)
t_W(WR)
t_(DV-WL)
CONDITIONS
Register URR
Other registers
MIN TYP
50
20
10
10
2 x t_CY(XTAL1)
10
10
10
10
MAX
UNITS
ns
ns
ns
ns
ns
50
ns
ns
ns
ns
t_W(ALE)
ALE
t_AVLL
t_(AL-RWL)
CS
D7–D0
ADDRESS
DATA
(READ)
RD
t_W(RD)
t_(RL-DV)
WR
Figure 1. Multiplexed Parallel Bus Timing
t_(RWH-AH)
ADDRESS
t_(DV-WL)
DATA
(WRITE)
t_W(WR)
t_(RWH-AH)
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