BU2185F Datasheet, PDF (4/6 Pages) Rohm – Clock generator

Multimedia ICs
BU2185F
•Electrical characteristics (unless otherwise noted, Ta = 25°C, VDD (AVDD) = 3.3V, CL Ϲ 15PF, XTAL1 = shorted to
GND, XTAL2 = 36.864MHz, 18.43MHz) )
Parameter
Symbol
Min.
Typ.
Max.
Unit
Input low level voltage
VIL
—
— 0.3 × VDD
V
Input high level voltage
VIH
0.7 × VDD
—
—
V
Output low level voltage
VOL
—
—
0.4
V
Output high level voltage
VOH
2.4
—
—
V
Output low level voltage
VOL
—
—
0.4
V
Output high level voltage
VOH
DVDD-0.5
—
—
V
Operating circuit current
IDD
—
40
60
mA
Conditions
CTRL1, CTRL2, OE
CTRL1, CTRL2, OE
I OL = 4.0mA CLK1, CLK2, CLK3
I OH = – 4.0mA CLK1, CLK2, CLK3
I OL = 0.5mA XTAL1OUT, XTAL2OUT
I OH = – 0.5mA XTAL1OUT, XTAL2OUT
No load
〈When XTAL2 = 36.864MHz〉 (XTAL1 is shorted to GND)
CLK1 frequency1
CLK1-1
— 36.8640 —
CLK1 frequency2
CLK1-2
— 18.4320 —
CLK2 frequency
CLK2
— 27.0000 —
CLK3 frequency
CLK3
— 33.8688 —
MHz
MHz
MHz
MHz
XTAL2 output
CTRL1 = H, CTRL2 = L
XTAL2 1 / 2 output CTRL1 = L, CTRL2 = L
XTAL2 × 375 / 128 / 4 — CTRL2 = L
XTAL2 × 147 / 40 / 4 — CTRL2 = L
〈When XTAL2 = 18.432MHz〉 (XTAL1 is shorted to GND)
CLK1 frequency1
CLK1
— 18.4320 —
CLK2 frequency
CLK2
— 27.0000 —
CLK3 frequency
CLK3
— 33.8688 —
MHz
MHz
MHz
XTAL2 output CTRL1 = H, CTRL2 = H
XTAL2 × 375 / 64 / 4 — CTRL2 = H
XTAL2 × 147 / 20 / 4 — CTRL2 = H
DUTY
JITTER
JITTER
27MHz S / N
DUTY
45
50
55
%
1 / 2VDD
J1s
—
100
—
psec Reference value (1sigma)
Jabs
—
600
—
psec Reference value (min.-to-max. width for jitter)
CLK2SN
—
65
—
dB
27MHz ± 20kHz RBW = 1kHz, SPAN = 200kHz
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