Datasheet

A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D00
t
SSSU
t
SU
t
H
t
PH
t
PL
t
SSH
t
SSOF
SS
(host)
SCK
(host)
MOSI
(host)
MISO
(device)
Hi-Z
'21¶7&$5(
t
OZD
t
ODZ
Hi-Z
20%
80%
V -
OD
V +
OD
V
OS
V = (V +) – (V -)
SSP-P OD OD
0V differential
t
r
+ V
OD
20%
80%
t
f
V
SSP-P
- V
OD
LMH0394
SNLS312L –AUGUST 2010–REVISED APRIL 2013 www.ti.com
SPI Interface AC Electrical Characteristics
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
(1)
.
Symbol Parameter Conditions Reference Min Typ Max Units
Recommended Input Timing Requirements
f
SCK
SCK Frequency SCK 20 MHz
t
PH
SCK Pulse Width High Figure 2, Figure 3 % SCK
40
period
t
PL
SCK Pulse Width Low % SCK
40
period
t
SU
MOSI Setup Time Figure 2, Figure 3 MOSI 4 ns
t
H
MOSI Hold Time 4 ns
t
SSSU
SS Setup Time Figure 2, Figure 3 SS 14 ns
t
SSH
SS Hold Time 4 ns
t
SSOF
SS Off Time SCK
1
period
Switching Characteristics
t
ODZ
MISO Driven-to-TRI-STATE Figure 3 MISO
20 ns
Time
t
OZD
MISO TRI-STATE-to-Driven
10 ns
Time
t
OD
MISO Output Delay Time 15 ns
(1) Typical values are stated for V
CC
= +2.5V and T
A
= +25°C.
Timing Diagrams
Figure 1. LVDS Output Voltage, Offset, and Timing Parameters
Figure 2. SPI Write
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