X1228
Notes: (1) The device enters the Active state after any start, and remains active: for 9 clock cycles if the Device Select Bits in the Slave
Address Byte are incorrect or until 200nS after a stop ending a read or write operation.
(2) The device enters the Program state 200nS after a stop ending a write operation and continues for t
.
WC
(3) The device goes into the Timekeeping state 200nS after any stop, except those that initiate a nonvolatile write cycle; t
after a
WC
stop that initiates a nonvolatile write cycle; or 9 clock cycles after any start that is not followed by the correct Device Select Bits in
the Slave Address Byte.
(4) For reference only and not tested.
(5)
(6)
(7)
(8)
(9)
V
V
V
V
V
= V x 0.1, V = V x 0.9, f
= 400KHz
SCL
IL
CC
IH
CC
= 0V
CC
= 0V
BACK
= V
=V , Others = GND or V
CC
SDA
SDA
SDA
SCL CC
=V
=V
, Others = GND or V
SCL BACK BACK
(10) V
= GND or V , V
= GND or V , V
= V or GND
CC SCL
CC RESET CC
(11) I = 3.0mA at 5.5V, 1.5mA at 2.7V
OL
(12) I
= -1.0mA at 5.5V, -0.4mA at 2.7V
OH
(13) Threshold voltages based on the higher of Vcc or Vback.
(14) Using recommended crystal and oscillator network applied to X1 and X2 (25°C).
(15) Typical values are for T = 25°C
A
Capacitance T = 25°C, f = 1.0 MHz, V
= 5V
A
CC
Symbol
Parameter
Output Capacitance (SDA, PHZ/IRQ, RESET)
Input Capacitance (SCL)
Max.
10
Units
pF
Test Conditions
= 0V
(1)
C
V
OUT
OUT
(1)
C
10
pF
V
= 0V
IN
IN
Notes: (1) This parameter is not 100% tested.
(2) The input capacitance between x1 and x2 pins can be varied between 5pF and 19.75pF by using analog trimming registers
AC CHARACTERISTICS
AC Test Conditions
Input Pulse Levels
V
x 0.1 to V x 0.9
CC
CC
Input Rise and Fall Times
10ns
Input and Output Timing
Levels
V
x 0.5
CC
Output Load
Standard Output Load
Figure 18. Standard Output Load for testing the device with V = 5.3V
CC
Equivalent AC Output Load Circuit for V
= 5V
CC
5.0V
5.0V
For V = 0.4V
OL
1316Ω
806Ω
1533Ω
and I = 3 mA
OL
PHZ/IRQ
SDA
100pF
100pF
Characteristics subject to change without notice. 5 of 31
REV 1.3 3/24/04
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