SAP5 Datasheet, PDF (42/66 Pages) Integrated Device Technology – AS-Interface Spec. V3.0 Compliant Universal AS-i IC

SAP51 / SAP5S Datasheet
Table 5.18 SAP5 Initialization Times
PARAMETER
Initialization time after Software Reset (generated by master
calls Reset_Slave or Broadcast_Reset) or external reset via
DSTBn ¹⁾
Initialization time after power on ²⁾
Initialization time after power-on with high capacitive load ¹⁾
1) Guaranteed by design.
2) Power starts when VLTGP = 18V at the latest.
SYMBOL
tINIT
CONDITIONS
MIN MAX UNIT
2
ms
tINIT2
tINIT3
CUOUT ≤ 10µF
CUOUT = 470µF
30
ms
1000 ms
5.13.1. Power-On Reset
In order to force the SAP5 into a defined state after power-on and to avoid uncontrolled switching of the digital
logic if the 5V supply (U5R) falls below a specified minimum level, a Power-On Reset is executed under the
conditions given in Table 5.19.
Table 5.19 Power-On Reset (POR) Threshold Voltages
PARAMETER
SYMBOL CONDITIONS MIN MAX UNIT
VU5R voltage to trigger internal reset procedure, falling voltage ¹⁾
VU5R voltage to trigger initialization procedure, rising voltage ¹⁾
VPOR1F
VPOR1R
1.2
1.7
V
3.5
4.3
V
Power-On Reset pulse width
tLOW
4
6
µs
1) Guaranteed by design.
Figure 5.5 Power-On Behavior (all modes)
LTGP _{approx. 15V}
U5R
V_POR1R
V_POR1F
t_LOW
Reset
Note: The Power-On Reset circuit has a threshold voltage reference. This reference matches the process
tolerance of the logic levels and therefore is not accurate. All values depend slightly on the rise and fall time of the
supply voltage.
© 2016 Integrated Device Technology, Inc.
42
January 28, 2016