Datasheet

DS26514 4-Port T1/E1/J1 Transceiver
19-5856; Rev 4; 5/11 285 of 305
13. AC TIMING CHARACTERISTICS
Unless otherwise noted, all timing numbers assume 20pF test load on output signals, 40pF test load on bus
signals.
13.1 Microprocessor Bus AC Characteristics
13.1.1 SPI Bus Mode
Table 13-1. SPI Bus Mode Timing
(See Figure 13-1.)
SYMBOL
(Note 1)
CHARACTERISTIC (Note 2) SYMBOL MIN MAX UNITS
Operating Frequency
Slave
f
BUS(S)
5 MHz
t1 Cycle Time: Slave t
CYC(S)
200 ns
t2 Enable Lead Time t
LEAD(S)
15 ns
t3 Enable Lag Time t
LAG(S)
15 ns
t4, t5
Clock (CLK) Duty Cycle
Slave (t4/t1 or t5/t1)
t
CLKH(S)
80 ns
t6
Data Setup Time (Inputs)
Slave
t
SU(S)
5 ns
t7
Data Hold Time (Inputs)
Slave
t
H(S)
15 ns
t8 Disable Time, Slave (Note 3) t
DIS(S)
25 ns
t9
Data Valid Time, After Enable Edge
Slave (Note 4)
t
V(S)
40 ns
t10
Data Hold Time, Outputs, After Enable Edge
Slave
t
HD(S)
5 ns
Note 1: Symbols refer to dimensions in Figure 13-1.
Note 2: 100pF load on all SPI pins.
Note 3: Hold time to high-impedance state.
Note 4: With 100pF on all SPI pins.