Philips Semiconductors Product data sheet
SC26C562
CMOS dual universal serial communications controller
(CDUSCC)
2006 Aug 10
12
AC ELECTRICAL CHARACTERISTICS (Continued)
CSN (CEN)
t
RDLGII
RDN
GPI1N
AND/OR
GPI2N
t
GIVRDL
SD00242
Figure 8. Input Port Timing
LIMITS
Min Max
t
GIVRDL
GPI input valid to RDN LOW 20 – ns
t
RDLGII
RDN LOW to GPI input invalid 40 – ns
t
CLHCLL
t
CCHCCL
t
RCHRCL
t
TCHTCL
X1/CLK
CTCLK
RxC
TxC
t
CLLCLH
t
CCLCCH
t
RCLRCH
t
TCLTCH
DRIVING
FROM EXTERNAL
SOURCE
TTL
X
1
X
2
X
2
OPEN WHEN
X
1
IS DRIVEN
NOTE: C
L1
AND C
L2
VALUES DEPEND ON
CRYSTAL
MANUFACTURER’S REQUIREMENTS, AND SHOULD
INCLUDE C
P1
AND C
P2
TO
CDUSCC
CIRCUITS
C
P1
C
P2
SC26C562
÷2
50-150kΩ
C
P1
= 7-12pF
C
P2
= 12-17pF
C
L1
C
L2
X
1
X
2
V
CC
*Pull-up resistor is not required when using CMOS levels
*
470Ω
SD00243
Figure 9. Clock Timing
LIMITS
Min Typ Max
t
CLHCLL
X1/CLK HIGH to LOW time 25 – – ns
t
CLLCLH
X1/CLK LOW to HIGH time 25 – – ns
t
CCHCCL
C/T CLK HIGH to LOW time 45 – – ns
t
CCLCCH
C/T CLK LOW to HIGH time 45 – – ns
t
RCHRCL
RxC HIGH to LOW time 50 – – ns
t
RCLRCH
RxC LOW to HIGH time 50 – – ns
t
TCHTCL
TxC HIGH to LOW time 50 – – ns
t
TCLTCH
TxC LOW to HIGH time 50 – – ns
f
CL
X1/CLK frequency
11
0 14.7456 16.0 MHz
f
CC
C/T CLK frequency 0 – 10 MHz
f
RC
RxC frequency (16X or 1X @ 50% duty cycle) 0 – 10 MHz
f
TC
TxC frequency (16X or 1X @ 50% duty cycle) 0 – 10 MHz
f
RTC
Tx/Rx frequency for FM/Manchester encoding – – 5 MHz
