Voltage Range on Any Non-Supply Pin Relative to Ground -1.0V to +5.5V
Supply Voltage Range -0.3V to +3.63V
Operating Temperature Range for DS21Q44T 0ºC to +70ºC Operating Temperature Range for DS21Q44TN -40ºC to +85ºC
Storage Temperature Range -55ºC to +125ºC
Soldering Temperature Range See IPC/JEDEC J-STD-020A
*This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time can affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(TA = 0°C to +70°C for DS21FF44/DS21FT44 TA = -40°C to +85°C for DS21FF44N/DS21FT44N)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Logic 1 VIH 2.2 5.5 V
Logic 0 VIL -0.3 +0.8 V
Supply VDD 2.97 3.63 V
CAPACITANCE
(TA = +25°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Input Capacitance CIN 5 pF
Output Capacitance COUT 7 pF
DC CHARACTERISTICS
(VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44 VDD = 2.97 to 3.63V, TA = -40ºC to +85ºC for DS21FF44N/DS21FT44N)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Supply Current at 3.3V
(DS21FT44) IDD 225 mA 1
Supply Current at 3.3V
(DS21FF44) IDD 300 mA 1
Input Leakage IIL -1.0 +1.0 µA 2
Output Leakage ILO 1.0 µA 3
Output Current (2.4V) IOH -1.0 mA
Output Current (0.4V) IOL +4.0 mA
NOTES:
1) TCLK = RCLK = TSYSCLK = RSYSCLK = 2.048MHz; outputs open-circuited.
2) 0.0V < VIN < VDD
3) Applied to INT* when tri-stated.
AC CHARACTERISTICS—MULTIPLEXED PARALLEL PORT (MUX = 1)
(VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44;
VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FT44N)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Cycle Time tCYC 200 ns
Pulse Width, DS low or
RD* high PWEL 100 ns
Pulse Width, DS high or
RD* low PWEH 100 ns
Input Rise/Fall times tR, tF 20 ns
R/W* Hold Time tRWH 10 ns
R/W* Setup time before
DS high tRWS 50 ns
CS*, FSO or FS1 Setup time before DS, WR* or
RD* active tCS 20 ns
CS*, FSO or FS1 Hold
time tCH 0 ns
Read Data Hold time tDHR 10 50 ns
Write Data Hold time tDHW 10 ns
Muxed Address valid to
AS or ALE fall tASL 15 ns
Muxed Address Hold
time tAHL 10 ns
Delay time DS, WR* or
RD* to AS or ALE rise tASD 20 ns
Pulse Width AS or ALE
high PWASH 30 ns
Delay time, AS or ALE
to DS, WR* or RD* tASED 10 ns
Output Data Delay time
from DS or RD* tDDR 20 80 ns
Data Setup time tDSW 50 ns
See Figures 23-1 to 23-3 for details
AC CHARACTERISTICS—NONMULTIPLEXED PARALLEL PORT (MUX = 0)
(VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44;
VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FTN44)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Setup Time for A0 to A7, FS0 or FS1 Valid to
CS* Active t1 0 ns
Setup Time for CS*
Active to either RD*, WR*, or DS* Active
t2 0 ns
Delay Time from either RD* or DS* Active to Data Valid
t3 75 ns
Hold Time from either RD*, WR*, or DS*
Inactive to CS* Inactive
t4 0 ns
Hold Time from CS*
Inactive to Data Bus 3–
state
t5 5 50 ns
Wait Time from either WR* or DS* Active to
Latch Data t6 75 ns
Data Setup Time to either WR* or DS*
Inactive
t7 15 ns
Data Hold Time from either WR* or DS*
Inactive
t8 10 ns
Address Hold from either WR* or DS*
inactive
t9 10 ns
See Figures 23–4 to 23–7 for details.
AC CHARACTERISTICS—RECEIVE SIDE
(VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44 VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FT44N)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
RCLK Period tCP 488 ns
RCLK Pulse Width tCH
tCL 75 ns
RSYSCLK Period tSP
tSP 122 648
488 ns 1
2 RSYSCLK Pulse Width tSH
tSL 50 ns
RSYNC Setup/Hold to
RSYSCLK Falling tSU
tHD 20 tSH - 5 ns
RSYNC Pulse Width tPW 50 ns
RPOS/RNEG Setup to
RCLK Falling tSU 20 ns
RPOS/RNEG Hold From
RCLK Falling tHD 20 ns
RSYSCLK/RCLKI Rise
and Fall Times tR, tF 25 ns
Delay RCLK to RSER,
RSIG, RLINK Valid tD1 50 ns
Delay RCLK to RCHCLK, RSYNC, RCHBLK, RFSYNC, RLCLK
tD2 50 ns
Delay RSYSCLK to
RSER, RSIG Valid tD3 50 ns
Delay RSYSCLK to RCHCLK, RCHBLK, RMSYNC, RSYNC
tD4 50 ns
See Figures 23-8 to 23-10 for details.
NOTES:
1) RSYSCLK = 1.544MHz 2) RSYSCLK = 2.048MHz
AC CHARACTERISTICS—TRANSMIT SIDE
(VDD = 2.97 to 3.63V, TA = 0°C to +70°C for DS21FF44/DS21FT44 VDD = 2.97 to 3.63V, TA = -40°C to +85°C for DS21FF44N/DS21FT44N)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
TCLK Period tCP 488 ns
TCLK Pulse Width tCH
tCL 75 ns
TCLKI Pulse Width tLH
tLL 75 ns
TSYSCLK Period tSP
tSP 122 648
448 ns 1
2 TSYSCLK Pulse Width tSH
tSL 50 ns
TSYNC or TSSYNC Setup/Hold to TCLK or TSYSCLK falling TSYNC or TSSYNC Pulse
Width tPW 50 ns
TSER, TSIG, TLINK Setup to TCLK, TSYSCLK Falling
tSU 20 ns
TSER, TSIG, TLINK Hold from TCLK, TSYSCLK
Falling tHD 20 ns
TCLK or TSYSCLK Rise
and Fall Times tR, tF 25 ns
Delay TCLK to TPOS,
TNEG Valid tDD 50 ns
Delay TCLK to TCHBLK, TCHCLK, TSYNC, TLCLK
tD2 50 ns
Delay TSYSCLK to
TCHCLK, TCHBLK tD3 75 ns
See Figures 23–11 to 23–13 for details.
NOTES:
1) TSYSCLK = 1.544MHz 2) TSYSCLK = 2.048MHz
Figure 23-1. INTEL BUS READ AC TIMING (BTS = 0 / MUX = 1)
Figure 23-3. MOTOROLA BUS AC TIMING (BTS = 1 / MUX = 1)
Figure 23-5. INTEL BUS WRITE AC TIMING (BTS = 0 / MUX = 0)
Figure 23-6. MOTOROLA BUS READ AC TIMING (BTS = 1 / MUX = 0)
Address Valid A0 to A7,
FS0, FS1
D0 to D7
RD*
CS*
WR*
0ns min.
0ns min.
75ns min.
0ns min.
10ns min.
10ns t1 min.
t2 t6 t4
t7 t8
Address Valid
Data Valid A0 to A7,
FS0, FS1
D0 to D7
R/W*
CS*
DS*
0ns min.
0ns min.
75ns max.
0ns min.
5ns min. / 20ns max.
t1
t2 t3 t4
t5
DS
0ns min.
75ns max. 0ns min.
t2 t3 t4
1
Notes:
1. The signal DS is active high when emulating the DS21Q43 (FMS = 1).
Figure 23-7. MOTOROLA BUS WRITE AC TIMING (BTS = 1 / MUX = 0)
Address Valid A0 to A7,
FS0, FS1
D0 to D7
R/W*
CS*
DS*
0ns min.
0ns min.
75ns min.
0ns min.
10ns min.
10ns min.
t1
t2 t6 t4
t7 t8
DS
0ns min.
75ns min.
1
Notes:
1. The signal DS is active high when emulating the DS21Q43 (FMS = 1) .
t2 t6
Figure 23-8. RECEIVE SIDE AC TIMING
tD1
1
tD2
tD2
t D2 tD2
RSER / RSIG
RCHCLK
RCHBLK
RSYNC
RLCLK
RLINK
tD1
Notes:
1. RSYNC is in the output mode (RCR1.5 = 0).
2. RLCLK will only pulse high during Sa bit locations as defined in RCR2; no relationship between RLCLK and RSYNC or RFSYNC is implied.
RCLK
t D2 RFSYNC / RMSYNC
MSB of Channel 1
2
Sa4 to Sa8 Bit Position
Figure 23-9. RECEIVE SYSTEM SIDE AC TIMING
tR tF
tD3
1
tD4
tD4
tD4
t tSU
HD
2 RSER / RSIG
RCHCLK
RCHBLK
RSYNC
RSYNC Notes:
1. RSYNC is in the output mode (RCR1.5 = 0) 2. RSYNC is in the input mode (RCR1.5 = 1) RSYSCLK
tSL
tSP tSH
tD4 RMSYNC
MSB of Channel 1
Figure 23-10. RECEIVE LINE INTERFACE AC TIMING
Figure 23-11. TRANSMIT SIDE AC TIMING
tR tF
3. TSER is sampled on the falling edge of TCLK when the transmit side elastic store is disabled.
4. TCHCLK and TCHBLK are synchronous with TCLK when the transmit side elastic store is disabled.
5. TLINK is only sampled during Sa bit locations as defined in TCR2; no relationship between TLCLK/TLINK and TSYNC is implied.
5
Figure 23-12. TRANSMIT SYSTEM SIDE AC TIMING
tR tF
TSYSCLK
TSER
TCHCLK
t SL t
t SH
SP
TSSYNC TCHBLK
tD3
tD3 t
tSU tHD
SU
tHD
Notes:
1. TSER is only sampled on the falling edge of TSYSCLK when the transmit side elastic store is enabled.
2. TCHCLK and TCHBLK are synchronous with TSYSCLK when the transmit side elastic store is enabled.