DS8007 Datasheet, PDF (8/41 Pages) Dallas Semiconductor – Multiprotocol Dual Smart Card Interface

Multiprotocol Dual Smart Card Interface
AC ELECTRICAL SPECIFICATIONS—TIMING PARAMETERS FOR NONMULTIPLEXED
PARALLEL BUS (READ AND WRITE)
(V_DD = 3.3V, V_DDA = 3.3V, T_A = +25°C, unless otherwise noted.) (See Figure 2.)
PARAMETER
RD High to CS Low
Access Time CS Low to Data Out Valid
SYMBOL
t₁
t₂
CONDITIONS
MIN TYP MAX UNITS
10
ns
50
ns
CS High to Data Out High Impedance
t₃
10
ns
Data Valid to End of Write
t₄
Data Hold Time
t₅
RD Low to CS or WR Low
t₆
Address Stable to CS or WR High
t₇
Address to CS Low
t₈
10
ns
10
ns
10
ns
10
ns
10
ns
READ
CS
t₁
t₂
t₃
WR (EN)
RD (R/W)
AD3–AD0
D7–D0
t₈
ADDRESS
DATA OUT
WRITE
CS
WR (EN)
CS
WR (EN)
RD (R/W)
AD3–AD0
D7–D0
t₆
t₇
ADDRESS
t₄
t₅
DATA IN
Figure 2. Nonmultiplexed Parallel Bus Timing (Read and Write)
8 _____________________________________________________________________
WRITE
RELEASE
WITH CS
WRITE
RELEASE
WITH EN