PCF2123U/5GA/1 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2123U/5GA/1' PDF : 63 Pages View PDF
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
14. Dynamic characteristics
Table 46. SPI-bus characteristics
VSS = 0 V; 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 = 1.8 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 29)
fclk(SCL)
tSCL
tclk(H)
tclk(L)
tr
tf
tsu(CE)
th(CE)
trec(CE)
tw(CE)
SCL clock frequency
-
SCL time
345
clock HIGH time
90
clock LOW time
200
rise time
for SCL signal
-
fall time
for SCL signal
-
CE set-up time
40
CE hold time
40
CE recovery time
30
CE pulse width
measured after valid -
subaddress is
received
2.9 -
-
220
-
50
-
120
100 -
100 -
-
35
-
30
-
25
0.99 -
4.54 -
-
175
-
45
-
95
100 -
100 -
-
30
-
25
-
20
0.99 -
5.71 -
-
125
-
40
-
70
100 -
100 -
-
25
-
15
-
15
0.99 -
8.0 MHz
-
ns
-
ns
-
ns
100 ns
100 ns
-
ns
-
ns
-
ns
0.99 s
tsu
set-up time
set-up time for SDI 10 -
5
-
3
-
2
-
ns
data
th
td(R)SDO
tdis(SDO)
hold time
hold time for SDI data 25
SDO read delay time bus load = 50 pF
-
SDO disable time
no load value; bus will -
be held up by bus
capacitance; use RC
time constant with
application values
-
10
190 -
70 -
-
8
108 -
45 -
-
5
85 -
40 -
-
ns
60 ns
27 ns
tt(SDI-SDO) transition time from to avoid bus conflict 0
-
0
-
0
-
0
-
ns
SDI to SDO
PCF2123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 15 July 2013
© NXP B.V. 2013. All rights reserved.
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