XR16L788 Datasheet, PDF (34/42 Pages) Exar Corporation – HIGH PERFORMANCE OCTAL UART

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XR16L788 OCTAL UART
REV. 1.1.4
AC ELECTRICAL CHARACTERISTICS
TA=0^o to 70^oC (-40^o to +85^oC for industrial grade package), Vcc-3.3V and 5V +/-10% unless specified.
SYMBOL
PARAMETER
T_C1,T_C2 Clock Pulse Period
T_OSC Oscillator Frequency
T_ECK External Clock Frequency
3,3V
MIN
3.3V
MAX
5V
MIN
5V
MAX
UNITS NOTES
10
8
ns
16
24 MHz
33
50 MHz
T_AS
T_AH
T_CS
T_DY
T_RD
T_WR
T_RDV
T_WDS
T_RDH
T_WDH
Address Setup (16 Mode)
Address Hold (16 Mode)
Chip Select Width (16 Mode)
Delay between CS# Active Cycles (16 Mode)
Read Strobe Width (16 Mode)
Write Strobe Width (16 Mode)
Read Data Valid (16 Mode)
Write Data Setup (16 Mode)
Read Data Hold (16 Mode)
Write Data Hold (16 Mode)
5
5
ns
10
10
ns
50
50
ns
50
50
ns
50
50
ns
40
30
ns
35
25
ns
15
10
ns
15
10
ns
15
10
ns
T_ADS Address Setup (68 Mode)
10
5
ns
T_ADH Address Hold (68 Mode)
10
10
ns
T_RWS R/W# Setup to CS# (68 Mode)
10
10
ns
T_RDA Read Data Access (68 mode)
35
25
ns
T_RDH Read Data Hold (68 mode)
15
10
ns
T_WDS Write Data Setup (68 mode)
10
10
ns
T_WDH Write Data Hold (68 Mode)
10
10
ns
T_RWH CS# De-asserted to R/W# De-asserted (68 Mode)
10
10
ns
T_CSL CS# Width (68 Mode)
50
40
ns
T_CSD CS# Cycle Delay (68 Mode)
50
40
ns
ns
T_17D Delay from IOW# to Modem Output
50
50
ns
T_18D Delay to set Interrupt from Modem Input
50
35
ns
T_19D Delay to reset Interrupt from IOR#
50
35
ns
T_RST Reset Pulse
40
40
ns
34