Rainbow Electronics U3745BM - Manual (Page 27)

27
U3745BM
4663A–RKE–06/03
Programming
start pulse
(Figure 16,
Figure 19)
BR_Range0
BR_Range1
BR_Range2
BR_Range3
after POR
t1 2188
1104
561
290
11656
3176
3176
3176
3176
2155
1087
553
286
11479
3128
3128
3128
3128
1057 ´
T
Clk
533 ´
T
Clk
271 ´
T
Clk
140 ´
T
Clk
5632 ´
T
Clk
1535 ´
T
Clk
1535 ´
T
Clk
1535 ´
T
Clk
1535 ´
T
Clk
µs
Programming
delay period
(Figure 16,
Figure 19)
t2 795 798 783 786 384.5 ´
T
Clk
385.5 ´
T
Clk
µs
Synchroni-
zation pulse
(Figure 16,
Figure 19)
t3 265 261 128 ´ T
Clk
µs
Delay until the
program
window starts
(Figure 16,
Figure 19)
t4 131 129 63.5 ´ T
Clk
µs
Programming
window
(Figure 16,
Figure 19)
t5 530 522 256 ´ T
Clk
µs
Time frame
of a bit
(Figure 19)
t6 1060 1044 512 ´ T
Clk
µs
Programming
pulse (Figure
16, Figure 19)
t7 133 529 131 521 64 ´ T
Clk
256 ´
T
Clk
µs
Equivalent
acknowledge
pulse: E_Ack
(Figure 19)
t8 265 261 128 ´ T
Clk
µs
Equivalent
time window
(Figure 19)
t9 534 526 258 ´ T
Clk
µs
OFF-bit
programming
window
(Figure 16)
t10 930 916 449.5 ´ T
Clk
µs
Electrical Characteristics
All parameters refer to GND, V
S
= 5 V, T
amb
= 25
°
C, f
0
= 433.92 MHz and f
0
= 315 MHz, unless otherwise specified. The
possible operating range refer to different circuit conditions: V
S
= 4.5 V to 5.5 V, T
amb
= -40
°
C to +85
°
C
Parameter Test Condition Symbol
6.76438-Mhz Osc.
(Mode 1)
4.90625-Mhz Osc.
(Mode 0) Variable Oscillator
Unit Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.