diff --git a/artiq/gateware/rtio/phy/ttl_serdes_7series.py b/artiq/gateware/rtio/phy/ttl_serdes_7series.py
index 8ef6be219..d04095e93 100644
--- a/artiq/gateware/rtio/phy/ttl_serdes_7series.py
+++ b/artiq/gateware/rtio/phy/ttl_serdes_7series.py
@@ -75,7 +75,12 @@ class _IOSERDESE2_8X(Module):
                                       i_I=pad_o, o_O=pad_i, i_T=oserdes.t_out,
                                       io_IO=pad)
         else:
-            self.specials += Instance("IOBUFDS",
+            self.specials += Instance("IOBUFDS_INTERMDISABLE",
+                                      p_DIFF_TERM="TRUE",
+                                      p_IBUF_LOW_PWR="TRUE",
+                                      p_USE_IBUFDISABLE="TRUE",
+                                      i_IBUFDISABLE=self.oe,
+                                      i_INTERMDISABLE=self.oe,
                                       i_I=pad_o, o_O=pad_i, i_T=oserdes.t_out,
                                       io_IO=pad, io_IOB=pad_n)
         self.comb += [