w65c51n Western Design Center, Inc., w65c51n Datasheet - Page 28

• Manufacturer Part Number: w65c51n
• Description: Asynchronous Communications Interface Adapter Acia
• Manufacturer: Western Design Center, Inc.

READ TIMING DIAGRAM
Timing diagrams for transmit with external clock, receive with external clock and IRQB generation are
shown in Figures 21, 22 and 23 respectively. The corresponding timing characteristics are listed in Table
3.
Test and Crystal Specifications
1. Temperature stability ± 0.01% (-40° C to +85° C)
2. Characteristics at 25° C ± 2° C
a. Frequency (MHz)
b. Frequency tolerance (± %)
c. Resonance mode
d. Equivalent resistance (ohm) 400 max.
e. Drive level (mW)
f. Shunt capacitance (pF)
g. Oscillation mode
Transmit/Receive
Clock Rate
Transmit/Receive
Clock High Time
Transmit/Receive
Clock Low Time
XTLI to TxD
Propagation
Delay
RTS Propagation
Delay
IRQB Propagation
Delay (Clear)
Notes:
1. (t
*
The baud rate with external clocking is: Baud Rate =
Characteristic
R
, t
F
Table 2 Transmit/Receive Characteristics
= 10 to 30 nS)
1.8432
0.02
Series
2
7 max.
Fundamental
Symbol
t
t
t
t
t
CCY
t
DLY
IRQ
CH
DD
CL
400*
Min
175
175
-
-
-
1 MHz
Max
500
500
500
-
-
-
400*
Min
175
175
-
-
-
2 MHz
Max
500
500
500
16 x t
-
-
-
1
CCY
Unit
nS
nS
nS
nS
nS
nS
28