XA-SCC Datasheet, PDF (29/42 Pages) NXP Semiconductors – CMOS 16-bit communications microcontroller

Philips Semiconductors
CMOS 16-bit communications microcontroller
Preliminary specification
XA-SCC
PRELIMINARY AC ELECTRICAL CHARACTERISTICS (5.0V "10%)¹
V_DD = 5.0V "10%, T_amb = –40_C to +85_C (industrial)
SYMBOL FIGURE
PARAMETER
All Cycles
F_C
t_C
t_CHCX
t_CLCX
t_CLCH
t_CHCL
t_AVSL
t_CHAH
t_CHAV
t_CHSH
t_CHSL
t_CODH
System Clock Frequency
25 System Clock Period = 1/F_C
25 XTALIN High Time
25 XTALIN Low Time
25 XTALIN Rise Time
25 XTALIN Fall Time
All Address Valid to Strobe low
All Address hold after CLKOUT rising edge⁹
All Delay from CLKOUT rising edge to address valid
All Delay from CLKOUT rising edge to Strobe High⁹
All Delay from CLKOUT rising edge to Strobe Low⁹
26 ClkOut Duty Cycle High (into 40pF max.)
(See Warning Note 5 on page 31.)
t_CPWH
13, 14, 16, CAS Pulse Width High
20, 21, 22
t_CPWL
13, 21
All DRAM cycles
t_RP
24
CAS Pulse Width Low
RAS precharge time, thus minimum RAS high time⁸
Generic Data Read Only
t_AHDR
9, 16 Address hold (A19–A1 only, not A0) after CS, BLE, BHE rise at end
of Generic Data Read Cycle (not code fetch)
Data Read and Instruction Fetch Cycles
t_DIS
t_DIH
t_OHDE
9, 10, Data In Valid setup to ClkOut rising edge
12–14, 16,
17, 20, 21
Data In Valid hold after ClkOut rising edge²
10, 12, 13, OE high to XA Data Bus Driver Enable
16, 20, 21
Write Cycles
t_CHDV
t_DVSL
t_SHAH
t_SHDH
Refresh
11, 16
Clock High to Data Valid
Data Valid prior to Strobe Low
Minimum Address Hold Time after strobe goes inactive
Data hold after strobes (CS and BHE/BLE) high
t_CLRL
Wait Input
21 CAS low to RAS low
t_WS
24 WAIT setup (stable high or low) to CLKOUT rising edge
t_WH
24 WAIT hold (stable high or low) after CLKOUT rising edge
NOTE:
1. See notes after the 3.3V AC timing table.
LIMITS
MIN
MAX
0
33.33
t_C* 0.5
t_C* 0.4
–
–
t_C – 21
1
–
1
1
t_CHCX–7
t_C – 12
t_C – 10
(n * t_C) –16
note 8
30
–
–
–
5
5
–
–
25
21
19
t_CHCX+3
–
–
–
t_C –12
–
25
–
0
–
t_C – 14
–
–
25
t_C – 23
–
t_C – 25
–
t_C – 25
–
t_C – 15
–
20
–
0
–
UNIT
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1999 Mar 29
29