X1228 Datasheet, PDF (5/31 Pages) Xicor Inc. – Real Time Clock/Calendar/CPU Supervisor with EEPROM

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_WC after a
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) V_IL = V_CC x 0.1, V_IH = V_CC x 0.9, f_SCL = 400KHz
(6) V_CC = 0V
(7) V_BACK = 0V
(8) V_SDA = V_SCL=V_CC, Others = GND or V_CC
(9) V_SDA =V_SCL=V_BACK, Others = GND or V_BACK
(10) V_SDA = GND or V_CC, V_SCL = GND or V_CC, V_RESET = V_CC or GND
(11) I_OL = 3.0mA at 5.5V, 1.5mA at 2.7V
(12) I_OH = -1.0mA at 5.5V, -0.4mA at 2.7V
(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_A = 25°C
Capacitance T_A = 25°C, f = 1.0 MHz, V_CC = 5V
Symbol
Parameter
Max.
Units
Test Conditions
C_OUT⁽¹⁾ Output Capacitance (SDA, PHZ/IRQ, RESET)
10
pF
C_IN⁽¹⁾
Input Capacitance (SCL)
10
pF
V_OUT = 0V
V_IN = 0V
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
Input Rise and Fall Times
Input and Output Timing
Levels
Output Load
V_CC x 0.1 to V_CC x 0.9
10ns
V_CC x 0.5
Standard Output Load
Figure 18. Standard Output Load for testing the device with V_CC = 5.0V
Equivalent AC Output Load Circuit for V_CC = 5V
5.0V
5.0V
SDA
1533Ω
For V_OL= 0.4V
and I_OL = 3 mA
100pF
PHZ/IRQ
1316Ω
806Ω
100pF
REV 1.3 3/24/04
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Characteristics subject to change without notice. 5 of 31