DS8007A Datasheet, PDF (7/41 Pages) Maxim Integrated Products – Multiprotocol Dual Smart Card Interface

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
XTAL 1 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
50
UNITS
ns
ns
ns
ns
ns
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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