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PCF2123TS Datasheet(PDF) 39 Page - NXP Semiconductors

Part # PCF2123TS
Description  SPI Real time clock/calendar
PDF  55 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2123TS Datasheet(HTML) 39 Page - NXP Semiconductors

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PCF2123_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
39 of 55
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
12. Dynamic characteristics
Table 45.
SPI-bus characteristics
VSS =0V; Tamb = −40 °C to +85 °C. All timing values are valid within the operating supply voltage and temperature range and
referenced to VIL and VIH with an input voltage swing of VSS to VDD.
Symbol
Parameter
Conditions
VDD = 1.6 V
VDD = 2.4 V
VDD = 3.3 V
VDD = 5.0 V
Unit
Min
Max
Min
Max
Min
Max
Min
Max
Timing characteristics (see Figure 28)
fclk(SCL)
SCL clock frequency
-
2.9
-
4.54
-
5.71
-
8.0
MHz
tSCL
SCL time
345
-
220
-
175
-
125
-
ns
tclk(H)
clock HIGH time
90
-
50
-
45
-
40
-
ns
tclk(L)
clock LOW time
200
-
120
-
95
-
70
-
ns
tr
rise time
for SCL signal
-
100
-
100
-
50
-
50
ns
tf
fall time
for SCL signal
-
100
-
100
-
50
-
50
ns
tsu(CE)
CE set-up time
40
-
35
-
30
-
25
-
ns
th(CE)
CE hold time
40
-
30
-
25
-
15
-
ns
trec(CE)
CE recovery time
30
-
25
-
20
-
15
-
ns
tw(CE)
CE pulse width
measured after valid
subaddress is
received
-
0.99
-
0.99
-
0.99
-
0.99
s
tsu
set-up time
set-up time for SDI
data
10
-5
-3
-2
-ns
th
hold time
hold time for SDI data 25
-
10
-
8
-
5
-
ns
td(R)SDO
SDO read delay time
bus load = 50 pF
-
190
-
108
-
85
-
60
ns
tdis(SDO)
SDO disable time
no load value; bus will
be held up by bus
capacitance; use RC
time constant with
application values
-
70
-
45
-
40
-
27
ns
tt(SDI-SDO) transition time from
SDI to SDO
to avoid bus conflict
0
-
0
-
0
-
0
-
ns



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