Datasheet

MCP4728
DS22187E-page 8 © 2010 Microchip Technology Inc.
I
2
C SERIAL TIMING SPECIFICATIONS
Electrical Specifications: Unless otherwise specified, all limits are specified for T
A
= -40 to +125°C, V
SS
= 0V,
Standard and Fast Mode: V
DD
= +2.7V to +5.5V
High Speed Mode: V
DD
= +4.5V to +5.5V.
Parameters Sym Min Typ Max Units Conditions
Clock Frequency f
SCL
0 — 100 kHz Standard Mode
C
b
= 400 pF, 2.7V – 5.5V
0 — 400 kHz Fast Mode
C
b
= 400 pF, 2.7V – 5.5V
0 — 1.7 MHz High Speed Mode 1.7
C
b
= 400 pF, 4.5V – 5.5V
0 — 3.4 MHz High Speed Mode 3.4
C
b
= 100 pF, 4.5V – 5.5V
Bus Capacitive Loading Cb — — 400 pF Standard Mode
2.7V – 5.5V
— — 400 pF Fast Mode
2.7V – 5.5V
— — 400 pF High Speed Mode 1.7
4.5V – 5.5V
— — 100 pF High Speed Mode 3.4
4.5V – 5.5V
Start Condition Setup Time
(Start, Repeated Start)
T
SU:STA
4700 — ns Standard Mode
600 — — ns Fast Mode
160 — — ns High Speed Mode 1.7
160 — — ns High Speed Mode 3.4
Start Condition Hold Time
T
HD:STA
4000 — ns Standard Mode
600 — — ns Fast Mode
160 — — ns High Speed Mode 1.7
160 — — ns High Speed Mode 3.4
Stop Condition Setup Time
T
SU:STO
4000 — ns Standard Mode
600 — — ns Fast Mode
160 — — ns High Speed Mode 1.7
160 — — ns High Speed Mode 3.4
Clock High Time
T
HIGH
4000 — — ns Standard Mode
600 — — ns Fast Mode
120 — — ns High Speed Mode 1.7
60 — — ns High Speed Mode 3.4
Clock Low Time
T
LOW
4700 — — ns Standard Mode
1300 — — ns Fast Mode
320 — — ns High Speed Mode 1.7
160 — — ns High Speed Mode 3.4
Note 1:
This parameter is ensured by characterization and is not 100% tested.
2: After a Repeated Start condition or an Acknowledge bit.
3: If this parameter is too short, it can create an unintentional Start or Stop condition to other devices on the I
2
C bus line. If
this parameter is too long, the Data Input Setup (T
SU:DAT
) or Clock Low time (T
LOW
) can be affected.
Data Input: This parameter must be longer than t
SP
.
Data Output: This parameter is characterized, and tested indirectly by testing T
AA
parameter.
4: This specification is not a part of the I
2
C specification. This specification is equivalent to the Data Hold Time (T
HD:DAT
)
plus SDA Fall (or rise) time: T
AA
= T
HD:DAT
+ T
FSDA
(OR T
RSDA
).
5: Time between Start and Stop conditions.