stled325 STMicroelectronics, stled325 Datasheet - Page 38

• Manufacturer Part Number: stled325
• Description: I?c Interfaced, Advanced Led Controller/driver With Keyscan, Standby Power Management And Real Time Clock Rtc
• Manufacturer: STMicroelectronics

Electrical ratings
4.4
Note:
38/62
1
2
3
4
Oscillator and crystal characteristics
Table 18.
1. Reference value. T
Table 19.
1. Externally supplied. ST recommends the Citizen CFS-145 (1.5 x 5 mm) and the KDS DT-38 (3 x 8 mm) for
2. Circuit board layout considerations for the 32.768KHz crystal of minimum trace lengths and isolation from
Oscillator is not production tested.
Externally supplied. ST recommends the Citizen CFS-145 (1.5 x 5 mm) and the KDS DT-38
(3 x 8 mm) for thru-hole, or the KDS DMX-26S(3.2x8mm) for surface-mount, tuning fork-
type quartz crystals. KDS can be contacted at [e-mail] or http://www.kdsj.co.jp
Citizen can be contacted at [e-mail] or http://www.citizencrystal.com
Circuit board layout considerations for the 32.768KHz crystal of minimum trace lengths and
isolation from RF generating signals should be taken into account.
Guaranteed by design.
Symbol
Symbol
thru-hole, or the KDS DMX-26S(3.2x8mm) for surface-mount, tuning fork-type quartz crystals. KDS can be
contacted at [e-mail] or http://www.kdsj.co.jp. Citizen can be contacted at csd@citizen-
americal.com or http://www.citizencrystal.com
RF generating signals should be taken into account.
V
tSTA
CL1
CL2
CL
Rs
fo
STA
Oscillator characteristics
Crystal electrical characteristics
Oscillator start voltage
Oscillator start time
X
X
IC-to-IC frequency
variation
Series resistance
IN
OUT
Load capacitance
A
frequency
Parameter
Parameter
= 25 deg C, V
Resonant
(1)
(1)
Doc ID 17576 Rev 1
CC
(2)
= 3.0 V, CFM-145 (C
≤ 10 seconds
V
Conditions
Conditions
CC
= 3.0 V
L
= 6 pF, 32.768 KHz) manufactured by Citizen.
Min
Min
-20
1.5
32.768
12.5
Typ
Typ
35
40
Max
Max
+20
25
25
1
(3)
STLED325
Ppm
Unit
Unit
KHz
pF
pF
pF
kΩ
V
s